ASP.Net/Asp Control/Calendar — различия между версиями

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Версия 15:30, 26 мая 2010

Содержание

Add control to Calendar cell

<%@ Page Language="C#" %>
<HTML>
  <body>
    <script runat="server">
    void PrettyCalendar_OnDayRender (object Sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
      if (e.Day.Date == System.DateTime.Today)
      {
        e.Cell.Controls.Add(new LiteralControl("<br />"));
        e.Cell.Controls.Add(new LiteralControl("Today!"));      
      }
    }
    </script>
    <form runat="server" ID="Form1">
      <asp:Calendar ID="PrettyCalendar" 
                    Runat="server" 
                    OnDayRender="PrettyCalendar_OnDayRender">
        <TodayDayStyle ForeColor="Red" BackColor="Aqua"></TodayDayStyle>
        <DayStyle Font-Bold="True" 
                  HorizontalAlign="Left" 
                  Height="90px" 
                  BorderWidth="1px" 
                  BorderStyle="Solid" 
                  BorderColor="Red" 
                  Width="100px" 
                  VerticalAlign="Top" 
                  BackColor="Yellow"></DayStyle>
        <NextPrevStyle ForeColor="Blue"/>
        <DayHeaderStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" ForeColor="Brown" BorderStyle="Solid" BorderColor="Black" Width="100px" BackColor="#00C0C0"></DayHeaderStyle>
        <TitleStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" BorderStyle="Solid" BorderColor="Black" BackColor="#80FFFF"></TitleStyle>
        <WeekendDayStyle BackColor="#C0C0C0"></WeekendDayStyle>
      </asp:Calendar>
    </form>
  </body>
</HTML>



Allowing the Selection of Multiple Dates in a Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Allowing the Selection of Multiple Dates in a Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    selectionmode="DayWeekMonth"
    selectorstyle-font-bold="True"
    selectorStyle-backcolor="#3366ff"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
    selecteddaystyle-backcolor="#ffcc66"
    selecteddaystyle-font-bold="True"
/>
</form>
</BODY>
</HTML>



Assign today"s date to asp calendar (VB.net)

<%@ Page Language="VB" Trace="true" %>
<script runat="server">
    Sub Page_Load()
        Label1.Text = "www.nfex.ru"
        Calendar1.TodaysDate = DateTime.Now
    End Sub
    
</script>
<html>
<head>
    <title>Show Trace</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="Label1"
        Runat="server" />
    <asp:Calendar
        id="Calendar1"
        TodayDayStyle-BackColor="Yellow"
        Runat="server" />
    
    </div>
    </form>
</body>
</html>



Basic Calendar Control: show grid lines, show day header (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Creating a Basic Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    showgridlines="true"
    showdayheader="False"
    shownextprevmonth="False"
    showtitle="false"
/>
</form>
</BODY>
</HTML>



Calendar Control: day name format, first day of week (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Creating a Basic Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    daynameformat="Short"
    firstdayofweek="Monday"
    nextprevformat="FullMonth"
    titleformat="MonthYear"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
/>
</form>
</BODY>
</HTML>



Calendar control in code behind (C#)

<%@ Page language="c#" src="CalendarTest.aspx.cs" AutoEventWireup="false" Inherits="CalendarTest" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <P>
        <asp:Calendar id="Calendar1" runat="server" SelectionMode="DayWeekMonth" BorderWidth="1px" BackColor="#FFFFCC" Width="220px" DayNameFormat="FirstLetter" ForeColor="#663399" Height="200px" Font-Size="8pt" Font-Names="Verdana" BorderColor="#FFCC66" ShowGridLines="True">
          <TodayDayStyle ForeColor="White" BackColor="#FFCC66"></TodayDayStyle>
          <SelectorStyle BackColor="#FFCC66"></SelectorStyle>
          <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC"></NextPrevStyle>
          <DayHeaderStyle Height="1px" BackColor="#FFCC66"></DayHeaderStyle>
          <SelectedDayStyle Font-Bold="True" BackColor="#CCCCFF"></SelectedDayStyle>
          <TitleStyle Font-Size="9pt" Font-Bold="True" ForeColor="#FFFFCC" BackColor="#990000"></TitleStyle>
          <OtherMonthDayStyle ForeColor="#CC9966"></OtherMonthDayStyle>
        </asp:Calendar></P>
      <P>
        <asp:Label id="lbl" runat="server" Width="544px" Height="72px" Font-Size="Small" Font-Names="Verdana" Font-Bold="True">Look for the month of May ...</asp:Label></P>
    </form>
  </body>
</HTML>

<%-- CalendarTest.aspx.cs
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class CalendarTest : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Calendar Calendar1;
    protected System.Web.UI.WebControls.Label lbl;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      // Put user code to initialize the page here
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.Calendar1.DayRender += new System.Web.UI.WebControls.DayRenderEventHandler(this.Calendar1_DayRender);
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    private void Calendar1_DayRender(Object source, DayRenderEventArgs e)
    {
      // Check for May 5 in any year, and format it.
      if (e.Day.Date.Day == 5 && e.Day.Date.Month == 5)
      {
        e.Cell.BackColor = System.Drawing.Color.Yellow;
        // Add some static text to the cell.
        Label lbl = new Label();
        lbl.Text = "<br>My Birthday!";
        e.Cell.Controls.Add(lbl);
      }
    }
  }

--%>



Calendar Control: nextprevformat (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Creating a Basic Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    daynameformat="Short"
    firstdayofweek="Monday"
    nextprevformat="FullMonth"
    titleformat="MonthYear"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
/>
</form>
</BODY>
</HTML>



Calendar control: on day render (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub DateDisplayed(source As Object, e As DayRenderEventArgs)
    If e.Day.Date.Month = "2" and e.Day.Date.Day = "14" Then
        e.Cell.BackColor = System.Drawing.Color.Red
        e.Cell.ForeColor = System.Drawing.Color.Yellow
    ElseIf e.Day.Date.Month = "12" and e.Day.Date.Day = "25" Then
        e.Cell.BackColor = System.Drawing.Color.Green
        e.Cell.ForeColor = System.Drawing.Color.Red
    ElseIf e.Day.Date.Month = "10" and e.Day.Date.Day = "31" Then
        e.Cell.BackColor = System.Drawing.Color.Orange
        e.Cell.ForeColor = System.Drawing.Color.Black
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Controlling the Appearance of Individual Cells of Dates in the Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    ondayrender="DateDisplayed"
/>
</form>
</BODY>
</HTML>



Calendar Control: titleformat (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Creating a Basic Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    daynameformat="Short"
    firstdayofweek="Monday"
    nextprevformat="FullMonth"
    titleformat="MonthYear"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
/>
</form>
</BODY>
</HTML>



Calendar events: render and change events

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Calendar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:Label id="lblMonthChanged" runat="server" />
    <asp:Calendar ID="Calendar1" runat="server" 
      SelectionMode="DayWeekMonth" 
      CellPadding="7" 
      CellSpacing="5" 
      DayNameFormat="FirstTwoLetters" 
      FirstDayOfWeek="Monday" 
      NextMonthText="Next >" 
      PrevMonthText="< Prev" 
      ShowGridLines="True" 
      DayStyle-BackColor="White" 
      DayStyle-ForeColor="Black" 
      DayStyle-Font-Names="Arial" 
      OnSelectionChanged="Calendar1_SelectionChanged" 
      OnDayRender="Calendar1_DayRender" 
      OnVisibleMonthChanged="Calendar1_VisibleMonthChanged">
       <DayHeaderStyle 
        BackColor="Black" 
        Font-Names="Arial Black" 
        ForeColor="White" />
       <SelectedDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Italic="True" 
        Font-Names="Arial"
        ForeColor="Blue" />
       <SelectorStyle 
        BackColor="Cornsilk" 
        Font-Names="Arial" 
        ForeColor="Red" />
       <WeekendDayStyle 
        BackColor="LavenderBlush" 
        Font-Names="Arial" 
        ForeColor="Purple" />
       <OtherMonthDayStyle 
        BackColor="LightGray" 
        Font-Names="Arial" 
        ForeColor="White" />
       <TodayDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Names="Arial" 
        ForeColor="Green" />
       <NextPrevStyle 
        BackColor="DarkGray" 
        Font-Names="Arial" 
        ForeColor="Yellow" />
       <TitleStyle 
        BackColor="Gray" 
        Font-Names="Arial Black" 
        ForeColor="White" 
        HorizontalAlign="Left" />
     </asp:Calendar>
      <br/>
      <asp:Label id="lblCount" runat="server" />
      <br/>
      <asp:Label id="lblTodaysDate" runat="server" />
      <br/>
      <asp:Label id="lblSelected" runat="server" />
      <br/>
      <table>
         <tr>
            <td>
               Select a month:
            </td>
            <td>
               <asp:DropDownList 
                  id= "ddl"
                  AutoPostBack="true"
                  onSelectedIndexChanged = "ddl_SelectedIndexChanged"
                  runat="server">
                  <asp:ListItem text="January" value="1" />
                  <asp:ListItem text="February" value="2" />
                  <asp:ListItem text="March" value="3" />
                  <asp:ListItem text="May" value="5" />
                  <asp:ListItem text="June" value="6" />
                  <asp:ListItem text="July" value="7" />
                  <asp:ListItem text="August" value="8" />
                  <asp:ListItem text="September" value="9" />
                  <asp:ListItem text="October" value="10" />
                  <asp:ListItem text="November" value="11" />
                  <asp:ListItem text="December" value="12" />
               </asp:DropDownList>
            </td>
            <td>
               <asp:Button
                  id="btnTgif"
                  text="TGIF"
                  onClick="btnTgif_Click"
                  runat="server" />
            </td>
         </tr>
         <tr>
            <td colspan="2">&nbsp;</td>
         </tr>
         <tr>
            <td colspan="2"><b>Day Range</b></td>
         </tr>
         <tr>
            <td>Starting Day</td>
            <td>Ending Day</td>
         </tr>
         <tr>
            <td>
               <asp:TextBox id= "txtStart"  runat="server"
                  Width="25"
                  MaxLength="2" />
            </td>
            <td>
               <asp:TextBox id= "txtEnd" runat="server"
                  Width="25"
                  MaxLength="2" />
            </td>
            <td>
               <asp:Button id="btnRange" runat="server" 
                  text="Apply"
                  onClick="btnRange_Click" />
            </td>
         </tr>
      </table>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
     if (!IsPostBack)
     {
       Calendar1.VisibleDate = Calendar1.TodaysDate;
       ddl.SelectedIndex = Calendar1.VisibleDate.Month - 1;
     }
     lblTodaysDate.Text = "Today"s Date is " + Calendar1.TodaysDate.ToShortDateString();
   }
  protected void Calendar1_SelectionChanged(object sender, EventArgs e)
   {
     lblSelectedUpdate();
     lblCountUpdate();
     txtClear();
   }
  private void lblSelectedUpdate()
  {
    if (Calendar1.SelectedDate != DateTime.MinValue)
      lblSelected.Text = "The date selected is " +
      Calendar1.SelectedDate.ToShortDateString();
  }
  private void lblCountUpdate()
  {
    lblCount.Text = "Count of Days Selected:  " +
      Calendar1.SelectedDates.Count.ToString();
  }
  protected void ddl_SelectedIndexChanged(Object sender, EventArgs e)
  {
    Calendar1.SelectedDates.Clear();
    lblSelectedUpdate();
    lblCountUpdate();
    Calendar1.VisibleDate = new DateTime(Calendar1.VisibleDate.Year,
                Int32.Parse(ddl.SelectedItem.Value), 1);
    txtClear();
  }
  protected void btnTgif_Click(Object sender, EventArgs e)
  {
    int currentMonth = Calendar1.VisibleDate.Month;
    int currentYear = Calendar1.VisibleDate.Year;
    Calendar1.SelectedDates.Clear();
    for (int i = 1; i <= System.DateTime.DaysInMonth(currentYear,currentMonth); i++)
    {
      DateTime date = new DateTime(currentYear, currentMonth, i);
      if (date.DayOfWeek == DayOfWeek.Friday)
        Calendar1.SelectedDates.Add(date);
    }
    lblSelectedUpdate();
    lblCountUpdate();
    txtClear();
  }
  protected void btnRange_Click(Object sender, EventArgs e)
  {
    int currentMonth = Calendar1.VisibleDate.Month;
    int currentYear = Calendar1.VisibleDate.Year;
    DateTime StartDate = new DateTime(currentYear, currentMonth,
                  Int32.Parse(txtStart.Text));
    DateTime EndDate = new DateTime(currentYear, currentMonth,
                 Int32.Parse(txtEnd.Text));
    Calendar1.SelectedDates.Clear();
    Calendar1.SelectedDates.SelectRange(StartDate, EndDate);
    lblSelectedUpdate();
    lblCountUpdate();
  }
  private void txtClear()
  {
    txtStart.Text = "";
    txtEnd.Text = "";
  }
  protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
  {
    if (!e.Day.IsOtherMonth && e.Day.IsWeekend)
      e.Cell.BackColor = System.Drawing.Color.LightGreen;
    if (e.Day.Date.Month == 1 && e.Day.Date.Day == 1)
      e.Cell.Controls.Add(new LiteralControl("<br/>Happy New Year!"));
  }
  protected void Calendar1_VisibleMonthChanged(object sender, MonthChangedEventArgs e)
  {
    if ((e.NewDate.Year > e.PreviousDate.Year) ||
      ((e.NewDate.Year == e.PreviousDate.Year) &&
      (e.NewDate.Month > e.PreviousDate.Month)))
      lblMonthChanged.Text = "My future"s so bright...";
    else
      lblMonthChanged.Text = "Back to the future!";
    Calendar1.SelectedDates.Clear();
    lblSelectedUpdate();
    lblCountUpdate();
    txtClear();
  }
}



Calendar selected value changed event (VB.net)

<%@ Import namespace="System.Data" %>
<%@ Import namespace="System.Data.SqlClient" %>
<html>
  <head><title>Using the Calendar</title></head>
  <body>
    <h3>Using the Calendar</h3>
    <form runat="server">
      <asp:Label id="lblSelectedDate" runat="server" />
      <asp:Calendar id="calHire" runat="Server"
                    SelectionMode = "DayWeek"
                    OnSelectionChanged = "CalendarChange" />
    </form>
  </body>
</html>
<script language="VB" runat="server">
Sub CalendarChange(Source As Object, E As EventArgs)
  lblSelectedDate.Text = calHire.SelectedDate
End Sub
</script>



Calendar selection changed event

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Calendar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
     <asp:Calendar ID="Calendar1" runat="server" 
      SelectionMode="DayWeekMonth" 
      CellPadding="7" 
      CellSpacing="5" 
      DayNameFormat="FirstTwoLetters" 
      FirstDayOfWeek="Monday" 
      NextMonthText="Next >" 
      PrevMonthText="< Prev" 
      ShowGridLines="True" 
      DayStyle-BackColor="White" 
      DayStyle-ForeColor="Black" 
      DayStyle-Font-Names="Arial" 
      OnSelectionChanged="Calendar1_SelectionChanged">
       <DayHeaderStyle 
        BackColor="Black" 
        Font-Names="Arial Black" 
        ForeColor="White" />
       <SelectedDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Italic="True" 
        Font-Names="Arial"
        ForeColor="Blue" />
       <SelectorStyle 
        BackColor="Cornsilk" 
        Font-Names="Arial" 
        ForeColor="Red" />
       <WeekendDayStyle 
        BackColor="LavenderBlush" 
        Font-Names="Arial" 
        ForeColor="Purple" />
       <OtherMonthDayStyle 
        BackColor="LightGray" 
        Font-Names="Arial" 
        ForeColor="White" />
       <TodayDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Names="Arial" 
        ForeColor="Green" />
       <NextPrevStyle 
        BackColor="DarkGray" 
        Font-Names="Arial" 
        ForeColor="Yellow" />
       <TitleStyle 
        BackColor="Gray" 
        Font-Names="Arial Black" 
        ForeColor="White" 
        HorizontalAlign="Left" />
     </asp:Calendar>
      <br/>
      <asp:Label id="lblCount" runat="server" />
      <br/>
      <asp:Label id="lblTodaysDate" runat="server" />
      <br/>
      <asp:Label id="lblSelected" runat="server" />
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default : System.Web.UI.Page 
{
   protected void Calendar1_SelectionChanged(object sender, EventArgs e)
   {
     lblTodaysDate.Text = "Today"s Date is " +
         Calendar1.TodaysDate.ToShortDateString();
     if (Calendar1.SelectedDate != DateTime.MinValue)
       lblSelected.Text = "The date selected is " +
       Calendar1.SelectedDate.ToShortDateString();
     lblCountUpdate();
   }
  private void lblCountUpdate()
  {
    lblCount.Text = "Count of Days Selected:  " +
      Calendar1.SelectedDates.Count.ToString();
  }
}



Calendar selection mode: Day

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Calendar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Calendar Control</h1>
    <h2>SelectionMode</h2>
     <asp:Calendar ID="Calendar1" runat="server" SelectionMode="Day"></asp:Calendar>
    </div>
    </form>
</body>
</html>



Calendar selection mode: DayWeek

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Calendar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Calendar Control</h1>
    <h2>SelectionMode</h2>
     <asp:Calendar ID="Calendar1" runat="server" SelectionMode="DayWeek"></asp:Calendar>
    </div>
    </form>
</body>
</html>



Calendar selection mode: DayWeekMonth

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Calendar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Calendar Control</h1>
    <h2>SelectionMode</h2>
     <asp:Calendar ID="Calendar1" runat="server" SelectionMode="DayWeekMonth"></asp:Calendar>
    </div>
    </form>
</body>
</html>



Calendar with TodayDayStyle, SelectorStyle, NextPrevStyle, and SelectedDayStyle (C#)

<%@ Page language="c#" src="CalendarTest.aspx.cs" AutoEventWireup="false" Inherits="CalendarTest" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <P>
        <asp:Calendar id="Calendar1" runat="server" SelectionMode="DayWeekMonth" BorderWidth="1px" BackColor="#FFFFCC" Width="220px" DayNameFormat="FirstLetter" ForeColor="#663399" Height="200px" Font-Size="8pt" Font-Names="Verdana" BorderColor="#FFCC66" ShowGridLines="True">
          <TodayDayStyle ForeColor="White" BackColor="#FFCC66"></TodayDayStyle>
          <SelectorStyle BackColor="#FFCC66"></SelectorStyle>
          <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC"></NextPrevStyle>
          <DayHeaderStyle Height="1px" BackColor="#FFCC66"></DayHeaderStyle>
          <SelectedDayStyle Font-Bold="True" BackColor="#CCCCFF"></SelectedDayStyle>
          <TitleStyle Font-Size="9pt" Font-Bold="True" ForeColor="#FFFFCC" BackColor="#990000"></TitleStyle>
          <OtherMonthDayStyle ForeColor="#CC9966"></OtherMonthDayStyle>
        </asp:Calendar></P>
      <P>
        <asp:Label id="lbl" runat="server" Width="544px" Height="72px" Font-Size="Small" Font-Names="Verdana" Font-Bold="True">Look for the month of May ...</asp:Label></P>
    </form>
  </body>
</HTML>

<%-- CalendarTest.aspx.cs
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class CalendarTest : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Calendar Calendar1;
    protected System.Web.UI.WebControls.Label lbl;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      // Put user code to initialize the page here
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.Calendar1.DayRender += new System.Web.UI.WebControls.DayRenderEventHandler(this.Calendar1_DayRender);
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    private void Calendar1_DayRender(Object source, DayRenderEventArgs e)
    {
      // Check for May 5 in any year, and format it.
      if (e.Day.Date.Day == 5 && e.Day.Date.Month == 5)
      {
        e.Cell.BackColor = System.Drawing.Color.Yellow;
        // Add some static text to the cell.
        Label lbl = new Label();
        lbl.Text = "<br>My Birthday!";
        e.Cell.Controls.Add(lbl);
      }
    }
  }

--%>



Change Calendar selection based on data from the database (VB.net)

<%@ Import namespace="System.Data" %>
<%@ Import namespace="System.Data.SqlClient" %>
<html>
  <head><title>Calendar: Hire Dates</title></head>
  <body>
    <h3>Calendar: Hire Dates</h3>
    <form runat="server">
      <asp:ListBox id="lstEmployees" runat="server"
                   Rows="7"
                   Autopostback="True" /><br/>
      <asp:Label id="lblSelectedDate" runat="server" />
      <asp:Calendar id="calHire" runat="server"
                    SelectionMode = "None" />
    </form>
  </body>
</html>
<script language="VB" runat="server">
Sub Page_Load(Source As Object, E As EventArgs)
  Dim strConnection As String = ConfigurationSettings.AppSettings("YourDataName")
  Dim objConnection As New SqlConnection(strConnection)
  Dim strSQL As String = "SELECT ID, LastName, FirstName, HireDate FROM Employee;"
  Dim objAdapter As New SqlDataAdapter(strSQL, objConnection)
  Dim objDataSet As New DataSet("dsEmployees")
  objAdapter.Fill(objDataSet, "dtEmployees")
  If Not IsPostBack Then
    lstEmployees.DataSource = objDataSet
    lstEmployees.DataTextField = "LastName"
    lstEmployees.DataBind()
  Else
    Dim datHireDate As Date
    datHireDate = Convert.ToDateTime( _
objDataSet.Tables("dtEmployees").Rows(lstEmployees.SelectedIndex)("HireDate"))
    lblSelectedDate.Text = _
objDataSet.Tables("dtEmployees").Rows(lstEmployees.SelectedIndex)("LastName")
    calHire.VisibleDate = datHireDate
    calHire.SelectedDate = datHireDate
    lblSelectedDate.Text &= " hired on " & datHireDate
  End If
End Sub
</script>



Change size of Calendar

<%@ Page Language="C#" %>
<HTML>
  <body>
    <script runat="server">
    void PrettyCalendar_OnDayRender (object Sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
      if (e.Day.Date == System.DateTime.Today)
      {
        e.Cell.Controls.Add(new LiteralControl("<br />"));
        e.Cell.Controls.Add(new LiteralControl("Today!"));      
      }
    }
    </script>
    <form runat="server" ID="Form1">
      <asp:Calendar ID="PrettyCalendar" 
                    Runat="server" 
                    OnDayRender="PrettyCalendar_OnDayRender">
        <TodayDayStyle ForeColor="Red" BackColor="Aqua"></TodayDayStyle>
        <DayStyle Font-Bold="True" 
                  HorizontalAlign="Left" 
                  Height="90px" 
                  BorderWidth="1px" 
                  BorderStyle="Solid" 
                  BorderColor="Red" 
                  Width="100px" 
                  VerticalAlign="Top" 
                  BackColor="Yellow"></DayStyle>
        <NextPrevStyle ForeColor="Blue"/>
        <DayHeaderStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" ForeColor="Brown" BorderStyle="Solid" BorderColor="Black" Width="100px" BackColor="#00C0C0"></DayHeaderStyle>
        <TitleStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" BorderStyle="Solid" BorderColor="Black" BackColor="#80FFFF"></TitleStyle>
        <WeekendDayStyle BackColor="#C0C0C0"></WeekendDayStyle>
      </asp:Calendar>
    </form>
  </body>
</HTML>



Check the range of Calendar controls

<%@ Page Language="C#" %>
<HTML>
  <body>
    <script runat="server">
    void Page_Load(object sender, EventArgs e)
    {
      if(!IsPostBack)
        DepartureDate.SelectedDate = System.DateTime.Today;
    }
    void SearchButton_Click(object Sender, EventArgs e)
    {
      if(DepartureDate.SelectedDate <= System.DateTime.Today)
        ResultLabel.Text = "You must selected a Departure Date in the future.";
      else if(ReturnDate.SelectedDate < DepartureDate.SelectedDate)
        ResultLabel.Text = "Return Date must follow the Departure Date.";
      else   
        ResultLabel.Text = "Departing on " + DepartureDate.SelectedDate.ToShortDateString() +
          " and returning on " + ReturnDate.SelectedDate.ToShortDateString();
    }
    </script>
    <form runat="server" ID="Form1">
      <h1>Find a Flight</h1>
      <table>
        <tr>
          <td>Departure Date</td>
          <td><asp:Calendar ID="DepartureDate" Runat="server">
              <DayStyle Font-Size="X-Small"></DayStyle>
              <TitleStyle Font-Bold="True"></TitleStyle>
            </asp:Calendar></td>
        </tr>
        <tr>
          <td>Return Date</td>
          <td><asp:Calendar ID="ReturnDate" Runat="server">
              <DayStyle Font-Size="X-Small"></DayStyle>
              <TitleStyle Font-Bold="True"></TitleStyle>
            </asp:Calendar></td>
        </tr>
      </table>
      <asp:Button ID="SearchButton" Runat="server" Text="Search" OnClick="SearchButton_Click" />
      <br>
      <asp:Label ID="ResultLabel" Runat="server" />
    </form>
  </body>
</HTML>



Controlling the Appearance of Individual Cells of Dates (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub DateDisplayed(source As Object, e As DayRenderEventArgs)
    If e.Day.Date.Month = "2" and e.Day.Date.Day = "14" Then
        e.Cell.BackColor = System.Drawing.Color.Red
        e.Cell.ForeColor = System.Drawing.Color.Yellow
    ElseIf e.Day.Date.Month = "12" and e.Day.Date.Day = "25" Then
        e.Cell.BackColor = System.Drawing.Color.Green
        e.Cell.ForeColor = System.Drawing.Color.Red
    ElseIf e.Day.Date.Month = "10" and e.Day.Date.Day = "31" Then
        e.Cell.BackColor = System.Drawing.Color.Orange
        e.Cell.ForeColor = System.Drawing.Color.Black
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Controlling the Appearance of Individual Cells of Dates in the Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    ondayrender="DateDisplayed"
/>
</form>
</BODY>
</HTML>



Convert selected date from asp:Calendar to long string (VB.net)

<%@ Page Language="VB" %>
<script runat="server">
    Sub Button1_Click(sender As Object, e As EventArgs)
      Label1.Text = Calendar1.SelectedDate.ToLongDateString()
    End Sub
</script>
<html>
<head>
</head>
<body>
    <form runat="server">
        <p>
            <asp:Calendar id="Calendar1" runat="server"></asp:Calendar>
        </p>
        <p>
            <asp:Button id="Button1" onclick="Button1_Click" runat="server" Text="Button"></asp:Button>
        </p>
        <p>
            <asp:Label id="Label1" runat="server">Label</asp:Label>
        </p>
    </form>
</body>
</html>



Date Selection event in a Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub calSelectChange(ByVal Sender as Object, ByVal E as EventArgs)
    lblMessage.Text = "You selected " _
        & MyCal.SelectedDate
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Writing Code that Fires when a Date is Selected in a Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    onselectionchanged="calSelectChange"
/>
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
    Font-Bold="True"
/>
</form>
</BODY>
</HTML>



Day renderer

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Calendar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:Label id="lblMonthChanged" runat="server" />
    <asp:Calendar ID="Calendar1" runat="server" 
      SelectionMode="DayWeekMonth" 
      CellPadding="7" 
      CellSpacing="5" 
      DayNameFormat="FirstTwoLetters" 
      FirstDayOfWeek="Monday" 
      NextMonthText="Next >" 
      PrevMonthText="< Prev" 
      ShowGridLines="True" 
      DayStyle-BackColor="White" 
      DayStyle-ForeColor="Black" 
      DayStyle-Font-Names="Arial" 
      OnSelectionChanged="Calendar1_SelectionChanged" 
      OnDayRender="Calendar1_DayRender" 
      OnVisibleMonthChanged="Calendar1_VisibleMonthChanged">
       <DayHeaderStyle 
        BackColor="Black" 
        Font-Names="Arial Black" 
        ForeColor="White" />
       <SelectedDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Italic="True" 
        Font-Names="Arial"
        ForeColor="Blue" />
       <SelectorStyle 
        BackColor="Cornsilk" 
        Font-Names="Arial" 
        ForeColor="Red" />
       <WeekendDayStyle 
        BackColor="LavenderBlush" 
        Font-Names="Arial" 
        ForeColor="Purple" />
       <OtherMonthDayStyle 
        BackColor="LightGray" 
        Font-Names="Arial" 
        ForeColor="White" />
       <TodayDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Names="Arial" 
        ForeColor="Green" />
       <NextPrevStyle 
        BackColor="DarkGray" 
        Font-Names="Arial" 
        ForeColor="Yellow" />
       <TitleStyle 
        BackColor="Gray" 
        Font-Names="Arial Black" 
        ForeColor="White" 
        HorizontalAlign="Left" />
     </asp:Calendar>
      <br/>
      <asp:Label id="lblCount" runat="server" />
      <br/>
      <asp:Label id="lblTodaysDate" runat="server" />
      <br/>
      <asp:Label id="lblSelected" runat="server" />
      <br/>
      <table>
         <tr>
            <td>
               Select a month:
            </td>
            <td>
               <asp:DropDownList 
                  id= "ddl"
                  AutoPostBack="true"
                  onSelectedIndexChanged = "ddl_SelectedIndexChanged"
                  runat="server">
                  <asp:ListItem text="January" value="1" />
                  <asp:ListItem text="February" value="2" />
                  <asp:ListItem text="March" value="3" />
                  <asp:ListItem text="May" value="5" />
                  <asp:ListItem text="June" value="6" />
                  <asp:ListItem text="July" value="7" />
                  <asp:ListItem text="August" value="8" />
                  <asp:ListItem text="September" value="9" />
                  <asp:ListItem text="October" value="10" />
                  <asp:ListItem text="November" value="11" />
                  <asp:ListItem text="December" value="12" />
               </asp:DropDownList>
            </td>
            <td>
               <asp:Button
                  id="btnTgif"
                  text="TGIF"
                  onClick="btnTgif_Click"
                  runat="server" />
            </td>
         </tr>
         <tr>
            <td colspan="2">&nbsp;</td>
         </tr>
         <tr>
            <td colspan="2"><b>Day Range</b></td>
         </tr>
         <tr>
            <td>Starting Day</td>
            <td>Ending Day</td>
         </tr>
         <tr>
            <td>
               <asp:TextBox id= "txtStart"  runat="server"
                  Width="25"
                  MaxLength="2" />
            </td>
            <td>
               <asp:TextBox id= "txtEnd" runat="server"
                  Width="25"
                  MaxLength="2" />
            </td>
            <td>
               <asp:Button id="btnRange" runat="server" 
                  text="Apply"
                  onClick="btnRange_Click" />
            </td>
         </tr>
      </table>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
     if (!IsPostBack)
     {
       Calendar1.VisibleDate = Calendar1.TodaysDate;
       ddl.SelectedIndex = Calendar1.VisibleDate.Month - 1;
     }
     lblTodaysDate.Text = "Today"s Date is " + Calendar1.TodaysDate.ToShortDateString();
   }
  protected void Calendar1_SelectionChanged(object sender, EventArgs e)
   {
     lblSelectedUpdate();
     lblCountUpdate();
     txtClear();
   }
  private void lblSelectedUpdate()
  {
    if (Calendar1.SelectedDate != DateTime.MinValue)
      lblSelected.Text = "The date selected is " +
      Calendar1.SelectedDate.ToShortDateString();
  }
  private void lblCountUpdate()
  {
    lblCount.Text = "Count of Days Selected:  " +
      Calendar1.SelectedDates.Count.ToString();
  }
  protected void ddl_SelectedIndexChanged(Object sender, EventArgs e)
  {
    Calendar1.SelectedDates.Clear();
    lblSelectedUpdate();
    lblCountUpdate();
    Calendar1.VisibleDate = new DateTime(Calendar1.VisibleDate.Year,
                Int32.Parse(ddl.SelectedItem.Value), 1);
    txtClear();
  }
  protected void btnTgif_Click(Object sender, EventArgs e)
  {
    int currentMonth = Calendar1.VisibleDate.Month;
    int currentYear = Calendar1.VisibleDate.Year;
    Calendar1.SelectedDates.Clear();
    for (int i = 1; i <= System.DateTime.DaysInMonth(currentYear,currentMonth); i++)
    {
      DateTime date = new DateTime(currentYear, currentMonth, i);
      if (date.DayOfWeek == DayOfWeek.Friday)
        Calendar1.SelectedDates.Add(date);
    }
    lblSelectedUpdate();
    lblCountUpdate();
    txtClear();
  }
  protected void btnRange_Click(Object sender, EventArgs e)
  {
    int currentMonth = Calendar1.VisibleDate.Month;
    int currentYear = Calendar1.VisibleDate.Year;
    DateTime StartDate = new DateTime(currentYear, currentMonth,
                  Int32.Parse(txtStart.Text));
    DateTime EndDate = new DateTime(currentYear, currentMonth,
                 Int32.Parse(txtEnd.Text));
    Calendar1.SelectedDates.Clear();
    Calendar1.SelectedDates.SelectRange(StartDate, EndDate);
    lblSelectedUpdate();
    lblCountUpdate();
  }
  private void txtClear()
  {
    txtStart.Text = "";
    txtEnd.Text = "";
  }
  protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
  {
    if (!e.Day.IsOtherMonth && e.Day.IsWeekend)
      e.Cell.BackColor = System.Drawing.Color.LightGreen;
    if (e.Day.Date.Month == 1 && e.Day.Date.Day == 1)
      e.Cell.Controls.Add(new LiteralControl("<br/>Happy New Year!"));
  }
  protected void Calendar1_VisibleMonthChanged(object sender, MonthChangedEventArgs e)
  {
    if ((e.NewDate.Year > e.PreviousDate.Year) ||
      ((e.NewDate.Year == e.PreviousDate.Year) &&
      (e.NewDate.Month > e.PreviousDate.Month)))
      lblMonthChanged.Text = "My future"s so bright...";
    else
      lblMonthChanged.Text = "Back to the future!";
    Calendar1.SelectedDates.Clear();
    lblSelectedUpdate();
    lblCountUpdate();
    txtClear();
  }
}



Define and use calendar in code behind (C#)

<%@ Page language="c#" src="Calendar.aspx.cs" AutoEventWireup="false" Inherits="MyOwnCalendar" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:Calendar id="MyCalendar" style="Z-INDEX: 101; LEFT: 16px; POSITION: absolute; TOP: 24px"
        runat="server" Width="293px" Height="226px"></asp:Calendar>
      <asp:Label id="lblDates" style="Z-INDEX: 102; LEFT: 16px; POSITION: absolute; TOP: 272px" runat="server"
        Width="544px" Height="72px" Font-Bold="True" Font-Names="Verdana" Font-Size="Small"></asp:Label></form>
  </body>
</HTML>

<%--
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class MyOwnCalendar : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Calendar MyCalendar;
    protected System.Web.UI.WebControls.Label lblDates;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.MyCalendar.SelectionChanged += new System.EventHandler(this.MyCalendar_SelectionChanged);
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    private void MyCalendar_SelectionChanged(object sender, System.EventArgs e)
    {
      lblDates.Text = "You selected these dates:<br>";
      foreach (DateTime dt in MyCalendar.SelectedDates)
      {
        lblDates.Text += dt.ToLongDateString() + "<br>";
      }
    }
  }

--%>



Displaying a Date in the Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Not IsPostBack Then
        MyCal.SelectedDate = DateAdd( _
            Microsoft.VisualBasic.DateInterval.Month, 2, Today())
        MyCal.VisibleDate = DateAdd( _
            Microsoft.VisualBasic.DateInterval.Month, 2, Today())
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Displaying a Date in the Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
/>
</form>
</BODY>
</HTML>



Displaying a Selected Range of Dates in the Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    If Not IsPostBack Then
        Dim I as Integer
        For i = 0 to 4
            MyCal.SelectedDates.Add(DateAdd( _
                Microsoft.VisualBasic.DateInterval.Day, _
                i, Today()))
        Next
    End If
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Displaying a Selected Range of Dates in the Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    selectionmode="DayWeekMonth"
    selectorstyle-font-bold="True"
    selectorStyle-backcolor="#3366ff"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
    selecteddaystyle-backcolor="#ffcc66"
    selecteddaystyle-font-bold="True"
/>
</form>
</BODY>
</HTML>



Embed Javascript to C# code to create a popup window

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Select Date</title>
    <script language="javascript">
        function SetDate(dateToSet)
        {
            controlName = window.location.search.substr(1).substring(8);
            window.opener.document.forms[0].elements[controlName].value = dateToSet;
            self.close();
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Calendar ID="calDefault" 
                  runat="server" 
                  BackColor="White" 
                  BorderColor="#999999" 
                  CellPadding="4" 
                  DayNameFormat="Shortest" 
                  Font-Names="Verdana" 
                  Font-Size="8pt" 
                  ForeColor="Black" 
                  Height="100%" 
                  Width="100%" 
                  OnDayRender="calDefault_DayRender" >
        <SelectedDayStyle BackColor="#666666" Font-Bold="True" ForeColor="White" />
        <SelectorStyle BackColor="#CCCCCC" />
        <WeekendDayStyle BackColor="#FFFFCC" />
        <OtherMonthDayStyle ForeColor="#808080" />
        <TodayDayStyle BackColor="#CCCCCC" ForeColor="Black" />
        <NextPrevStyle VerticalAlign="Bottom" />
        <DayHeaderStyle BackColor="#CCCCCC" Font-Bold="True" Font-Size="7pt" />
        <TitleStyle BackColor="#999999" BorderColor="Black" Font-Bold="True" />
    </asp:Calendar>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default : System.Web.UI.Page
{
  protected void calDefault_DayRender(object sender, DayRenderEventArgs e)
  {
    HyperLink link = new HyperLink();
    LiteralControl lc = (LiteralControl)e.Cell.Controls[0];
    link.Text = lc.Text;
    link.NavigateUrl = "javascript:SetDate("" + e.Day.Date.ToShortDateString() + "");";
    e.Cell.Controls.Clear();
    e.Cell.Controls.Add(link);
  }
}



Formatting Date Sections in a Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Formatting Date Sections in a Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    daynameformat="Short"
    firstdayofweek="Default"
    nextprevformat="FullMonth"
    titleformat="MonthYear"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
    todaydaystyle-Font-Bold="True"
    todaydaystyle-backcolor="Yellow"
    selecteddayStyle-backcolor="#ffcc66"
    selecteddayStyle-font-bold="True"
    weekenddaystyle-font-italic="True"
    weekenddaystyle-forecolor="Red"
    othermonthdaystyle-font-italic="True"
    othermonthdaystyle-backcolor="white"
    othermonthdaystyle-forecolor="gray"
/>
</form>
</BODY>
</HTML>



Formatting the Header Styles in a Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Formatting the Header Styles in a Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    daynameformat="Short"
    firstdayofweek="Default"
    nextprevformat="FullMonth"
    titleformat="MonthYear"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
    dayheaderstyle-font-bold="True"
    dayheaderstyle-font-italic="True"
    dayheaderstyle-forecolor="DarkBlue"    
    titlestyle-backcolor="#3366ff"
    titlestyle-forecolor="white"
    titlestyle-font-bold="True"
    nextprevstyle-font-italic="True"
    nextprevstyle-backcolor="Yellow"
/>
</form>
</BODY>
</HTML>



Get selected date from asp:Calendar (VB.net)

<%@ Page Language="VB" %>
<script runat="server">
    Sub Calendar1_SelectionChanged(sender As Object, e As EventArgs)
      If Day (Calendar1.SelectedDate) = 13 And Calendar1.SelectedDate.DayOfWeek = 5 Then
        Label1.Text = "Careful! Friday 13th is an unlucky day for some people!"
      Else
        Label1.Text = "It"s just another day in life..."
      End If
    End Sub
</script>
<html>
<head>
</head>
<body>
    <form runat="server">
        <p>
            Please select a date:
        </p>
        <p>
            <asp:Calendar id="Calendar1" runat="server" OnSelectionChanged="Calendar1_SelectionChanged"></asp:Calendar>
        </p>
        <p>
            <asp:Label id="Label1" runat="server"></asp:Label>
        </p>
    </form>
</body>
</html>



Load event in calendar selection event (C#)

<%@ Page language="c#" src="Appointment.aspx.cs" AutoEventWireup="false" Inherits="Appointment" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:Calendar id="Calendar1" style="Z-INDEX: 101; LEFT: 16px; POSITION: absolute; TOP: 16px" runat="server" SelectionMode="DayWeekMonth" BorderWidth="1px" BackColor="#FFFFCC" Width="220px" DayNameFormat="FirstLetter" ForeColor="#663399" Height="200px" Font-Size="8pt" Font-Names="Verdana" BorderColor="#FFCC66" ShowGridLines="True">
        <TodayDayStyle ForeColor="White" BackColor="#FFCC66"></TodayDayStyle>
        <SelectorStyle BackColor="#FFCC66"></SelectorStyle>
        <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC"></NextPrevStyle>
        <DayHeaderStyle Height="1px" BackColor="#FFCC66"></DayHeaderStyle>
        <SelectedDayStyle Font-Bold="True" BackColor="#CCCCFF"></SelectedDayStyle>
        <TitleStyle Font-Size="9pt" Font-Bold="True" ForeColor="#FFFFCC" BackColor="#990000"></TitleStyle>
        <OtherMonthDayStyle ForeColor="#CC9966"></OtherMonthDayStyle>
      </asp:Calendar>
      <asp:ListBox id="lstTimes" style="Z-INDEX: 102; LEFT: 24px; POSITION: absolute; TOP: 248px" runat="server" Width="216px" Height="160px"></asp:ListBox>
    </form>
  </body>
</HTML>

<%-- Appointment.aspx.cs
using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
  public class Appointment : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Calendar Calendar1;
    protected System.Web.UI.WebControls.ListBox lstTimes;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.Calendar1.DayRender += new System.Web.UI.WebControls.DayRenderEventHandler(this.Calendar1_DayRender);
      this.Calendar1.SelectionChanged += new System.EventHandler(this.Calendar1_SelectionChanged);
      this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    private void Calendar1_DayRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
      // Check for May 5 in any year, and format it.
      if (e.Day.Date.Day == 5 && e.Day.Date.Month == 5)
      {
        e.Cell.BackColor = System.Drawing.Color.Yellow;
        // Add some static text to the cell.
        Label lbl = new Label();
        lbl.Text = "<br>My Birthday!";
        e.Cell.Controls.Add(lbl);
      }
    }
    private void Calendar1_SelectionChanged(object sender, System.EventArgs e)
    {
      lstTimes.Items.Clear();
      
      switch (Calendar1.SelectedDate.DayOfWeek)
      {
        case DayOfWeek.Monday:
          // Apply special Monday schedule.
          lstTimes.Items.Add("10:00 >> working");
          lstTimes.Items.Add("10:30 >> Meeting");
          lstTimes.Items.Add("11:00 >> Coding");
          break;
        default:
          lstTimes.Items.Add("10:00 >> Coding");
          lstTimes.Items.Add("10:30");
          lstTimes.Items.Add("11:00");
          lstTimes.Items.Add("11:30");
          lstTimes.Items.Add("12:00 >> lauching");
          lstTimes.Items.Add("12:30");
          break;
      }
    }
  }

--%>



On Date and Month Selection Changed (VB.net)

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    MyCal.SelectedDate = Today()
End Sub
Sub calSelectChange(ByVal Sender as Object, ByVal E as EventArgs)
    lblMessage.Text = "You selected " _
        & MyCal.SelectedDate
End Sub
Sub calMonthChange(ByVal source As Object, _
    ByVal e As MonthChangedEventArgs)
    lblMessage2.Text = "<BR>You changed from month " _
        & e.PreviousDate.Month & " to month " _
        & e.NewDate.Month & "."
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Calendar 2 Control Sample Page</TITLE>
</HEAD>
<BODY  >
<form runat="server">
<Font Face="Tahoma">
<asp:Calendar 
    id="Mycal" 
    runat="server"
    CellPadding="3"
    CellSpacing="3"
    DayNameFormat="Short"
    FirstDayOfWeek="Default"
    NextPrevFormat="FullMonth"
    SelectionMode="Day"
    ShowDayHeader="True"
    ShowGridLines="False"
    ShowNextPrevMonth="True"
    ShowTitle="True"
    TitleFormat="MonthYear"
    Font-Name="Tahoma"
    Font-Size="12"
    BackColor="ivory"
    TodayDayStyle-Font-Bold="True"
    DayHeaderStyle-Font-Bold="True"
    OtherMonthDayStyle-ForeColor="gray"
    TitleStyle-BackColor="#3366ff"
    TitleStyle-ForeColor="white"
    TitleStyle-Font-Bold="True"
    SelectedDayStyle-BackColor="#ffcc66"
    SelectedDayStyle-Font-Bold="True"
    WeekendDayStyle-Font-Italic="True"
    NextPrevStyle-Font-Italic="True"
    OnSelectionChanged="calSelectChange"
    OnVisibleMonthChanged="calMonthChange"
/>
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
    Font-Bold="True"
/><asp:Label
    id="lblMessage2"
    runat="server"
    Font-Bold="True"
/>
</Font>
</Form>
</BODY>
</HTML>



On visible month changed event for a calendar control (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub calMonthChange(ByVal source As Object, _
    ByVal e As MonthChangedEventArgs)
    lblMessage.Text = "<BR>You changed from month " _
        & e.PreviousDate.Month & " and year " _
        & e.PreviousDate.Year & " to month " _
        & e.NewDate.Month & " and year " _
        & e.NewDate.Year
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Writing Code that Fires when the Month Changes in a Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    onvisiblemonthchanged="calMonthChange"
/>
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
    Font-Bold="True"
/>
</form>
</BODY>
</HTML>



Popup calendar

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Popup Date Selector</title>
    <script language="javascript" type="text/javascript">
    function PickDate(controlName)
    {
        var wnd = null;
        var settings = "width=300,height=200,location=no,menubar=no,toolbar=no,scrollbars=no,resizable=yes,status=yes";
        var url = "Popup.aspx?control=" + controlName;
        wnd = window.open(url,"DatePopup",settings);
        if (wnd.focus){ wnd.focus(); }
    }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    Start Date:
    <asp:TextBox ID="txtDateStart" runat="server" Columns="10"></asp:TextBox>
    <asp:ImageButton ID="btnDateStart" runat="server" 
       ImageUrl="~/images/cal_allday.gif" 
       OnClientClick="PickDate("txtDateStart")" />
    <br />
    End Date:
    <asp:TextBox ID="txtDateEnd" runat="server" Columns="10"></asp:TextBox>
    <asp:ImageButton ID="btnDateEnd" runat="server" 
       ImageUrl="~/images/cal_allday.gif" 
       OnClientClick="PickDate("txtDateEnd")" />
    </div>
    Press enter key to continue.
    </form>
</body>
</html>



Reading Selected Dates in a Date Range through the Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<script runat=server>
Sub calSelectChange(ByVal Sender as Object, ByVal E as EventArgs)
    Dim i as Integer
    lblMessage.Text = "You selected:"
    For i = 0 to MyCal.SelectedDates.Count - 1
        lblMessage.Text = lblMessage.Text & "<BR>" _
            & MyCal.SelectedDates(i).ToShortDateString()
    Next    
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Reading Selected Dates in a Date Range through the Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    selectionmode="DayWeekMonth"
    selectorstyle-font-bold="True"
    selectorStyle-backcolor="#3366ff"
    font-name="Tahoma"
    font-size="12"
    backcolor="ivory"
    selecteddaystyle-backcolor="#ffcc66"
    selecteddaystyle-font-bold="True"
    onselectionchanged="calSelectChange"
/>
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
    Font-Bold="True"
/>
</form>
</BODY>
</HTML>



Select a week (VB.net)

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
    MyCal.SelectedDate = Today()
End Sub
Sub calSelectChange(ByVal Sender as Object, ByVal E as EventArgs)
    Dim i as Integer
    lblMessage.Text = "You selected:"
    For i = 0 to MyCal.SelectedDates.Count - 1
        lblMessage.Text = lblMessage.Text & "<BR>" _
            & MyCal.SelectedDates(i).ToShortDateString()
    Next    
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Calendar 3 Control Sample Page</TITLE>
</HEAD>
<BODY >
<form runat="server">
<Font Face="Tahoma">
<asp:Calendar 
    id="Mycal" 
    runat="server"
    CellPadding="3"
    CellSpacing="3"
    DayNameFormat="Short"
    FirstDayOfWeek="Default"
    NextPrevFormat="FullMonth"
    SelectionMode="DayWeekMonth"
    ShowDayHeader="True"
    ShowGridLines="False"
    ShowNextPrevMonth="True"
    ShowTitle="True"
    TitleFormat="MonthYear"
    Font-Name="Tahoma"
    Font-Size="12"
    BackColor="ivory"
    TodayDayStyle-Font-Bold="True"
    DayHeaderStyle-Font-Bold="True"
    OtherMonthDayStyle-ForeColor="gray"
    TitleStyle-BackColor="#3366ff"
    TitleStyle-ForeColor="white"
    TitleStyle-Font-Bold="True"
    SelectedDayStyle-BackColor="#ffcc66"
    SelectedDayStyle-Font-Bold="True"
    WeekendDayStyle-Font-Italic="True"
    NextPrevStyle-Font-Italic="True"
    SelectorStyle-Font-Bold="True"
    SelectorStyle-BackColor="#3366ff"
    OnSelectionChanged="calSelectChange"
/>
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
    Font-Bold="True"
/>
</Font>
</Form>
</BODY>
</HTML>



Selected value change envent for asp:Calendar (VB.net)

<%@ Page Language="VB" %>
<script runat="server">
    Sub Calendar1_SelectionChanged(sender As Object, e As EventArgs)
      If Day (Calendar1.SelectedDate) = 13 And Calendar1.SelectedDate.DayOfWeek = 5 Then
        Label1.Text = "Careful! Friday 13th is an unlucky day for some people!"
      Else
        Label1.Text = "It"s just another day in life..."
      End If
    End Sub
</script>
<html>
<head>
</head>
<body>
    <form runat="server">
        <p>
            Please select a date:
        </p>
        <p>
            <asp:Calendar id="Calendar1" runat="server" OnSelectionChanged="Calendar1_SelectionChanged"></asp:Calendar>
        </p>
        <p>
            <asp:Label id="Label1" runat="server"></asp:Label>
        </p>
    </form>
</body>
</html>



Set asp calendar border (VB.net)

<%@Page Language="C#"%>
<html>
<body>
<form runat="server">
<asp:calendar id="calTest" runat="server"
              BackColor="#ffff80"
              BorderColor="#c0c0c0"
              BorderStyle="ridge"
              BorderWidth="5" />
</form>
</body>
</html>



Set DayStyle, NextPrevStyle, DayHeaderStyle, TitleStyle, WeekendDayStyle

<%@ Page Language="C#" %>
<HTML>
  <body>
    <script runat="server">
    void PrettyCalendar_OnDayRender (object Sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
      if (e.Day.Date == System.DateTime.Today)
      {
        e.Cell.Controls.Add(new LiteralControl("<br />"));
        e.Cell.Controls.Add(new LiteralControl("Today!"));      
      }
    }
    </script>
    <form runat="server" ID="Form1">
      <asp:Calendar ID="PrettyCalendar" 
                    Runat="server" 
                    OnDayRender="PrettyCalendar_OnDayRender">
        <TodayDayStyle ForeColor="Red" BackColor="Aqua"></TodayDayStyle>
        <DayStyle Font-Bold="True" 
                  HorizontalAlign="Left" 
                  Height="90px" 
                  BorderWidth="1px" 
                  BorderStyle="Solid" 
                  BorderColor="Red" 
                  Width="100px" 
                  VerticalAlign="Top" 
                  BackColor="Yellow"></DayStyle>
        <NextPrevStyle ForeColor="Blue"/>
        <DayHeaderStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" ForeColor="Brown" BorderStyle="Solid" BorderColor="Black" Width="100px" BackColor="#00C0C0"></DayHeaderStyle>
        <TitleStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" BorderStyle="Solid" BorderColor="Black" BackColor="#80FFFF"></TitleStyle>
        <WeekendDayStyle BackColor="#C0C0C0"></WeekendDayStyle>
      </asp:Calendar>
    </form>
  </body>
</HTML>



Setting Custom Previous and Next Month Text in the Calendar Control (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Setting Custom Previous and Next Month Text in the Calendar Control</TITLE>
</HEAD>
<BODY LEFTMARGIN="40">
<form runat="server">
Select a Date
<BR><BR>
<asp:Calendar 
    id="Mycal" 
    runat="server"
    cellpadding="3"
    cellspacing="3"
    nextprevformat="CustomText"
    nextmonthtext="Next"
    prevmonthtext="Prev"
/>
</form>
</BODY>
</HTML>



Set TodayDayStyle: background color and foreground color

<%@ Page Language="C#" %>
<HTML>
  <body>
    <script runat="server">
    void PrettyCalendar_OnDayRender (object Sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
      if (e.Day.Date == System.DateTime.Today)
      {
        e.Cell.Controls.Add(new LiteralControl("<br />"));
        e.Cell.Controls.Add(new LiteralControl("Today!"));      
      }
    }
    </script>
    <form runat="server" ID="Form1">
      <asp:Calendar ID="PrettyCalendar" 
                    Runat="server" 
                    OnDayRender="PrettyCalendar_OnDayRender">
        <TodayDayStyle ForeColor="Red" BackColor="Aqua"></TodayDayStyle>
        <DayStyle Font-Bold="True" 
                  HorizontalAlign="Left" 
                  Height="90px" 
                  BorderWidth="1px" 
                  BorderStyle="Solid" 
                  BorderColor="Red" 
                  Width="100px" 
                  VerticalAlign="Top" 
                  BackColor="Yellow"></DayStyle>
        <NextPrevStyle ForeColor="Blue"/>
        <DayHeaderStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" ForeColor="Brown" BorderStyle="Solid" BorderColor="Black" Width="100px" BackColor="#00C0C0"></DayHeaderStyle>
        <TitleStyle Font-Size="Large" Font-Bold="True" BorderWidth="1px" BorderStyle="Solid" BorderColor="Black" BackColor="#80FFFF"></TitleStyle>
        <WeekendDayStyle BackColor="#C0C0C0"></WeekendDayStyle>
      </asp:Calendar>
    </form>
  </body>
</HTML>



Visible month changed event

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Calendar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:Label id="lblMonthChanged" runat="server" />
    <asp:Calendar ID="Calendar1" runat="server" 
      SelectionMode="DayWeekMonth" 
      CellPadding="7" 
      CellSpacing="5" 
      DayNameFormat="FirstTwoLetters" 
      FirstDayOfWeek="Monday" 
      NextMonthText="Next >" 
      PrevMonthText="< Prev" 
      ShowGridLines="True" 
      DayStyle-BackColor="White" 
      DayStyle-ForeColor="Black" 
      DayStyle-Font-Names="Arial" 
      OnSelectionChanged="Calendar1_SelectionChanged" 
      OnDayRender="Calendar1_DayRender" 
      OnVisibleMonthChanged="Calendar1_VisibleMonthChanged">
       <DayHeaderStyle 
        BackColor="Black" 
        Font-Names="Arial Black" 
        ForeColor="White" />
       <SelectedDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Italic="True" 
        Font-Names="Arial"
        ForeColor="Blue" />
       <SelectorStyle 
        BackColor="Cornsilk" 
        Font-Names="Arial" 
        ForeColor="Red" />
       <WeekendDayStyle 
        BackColor="LavenderBlush" 
        Font-Names="Arial" 
        ForeColor="Purple" />
       <OtherMonthDayStyle 
        BackColor="LightGray" 
        Font-Names="Arial" 
        ForeColor="White" />
       <TodayDayStyle 
        BackColor="Cornsilk" 
        Font-Bold="True" 
        Font-Names="Arial" 
        ForeColor="Green" />
       <NextPrevStyle 
        BackColor="DarkGray" 
        Font-Names="Arial" 
        ForeColor="Yellow" />
       <TitleStyle 
        BackColor="Gray" 
        Font-Names="Arial Black" 
        ForeColor="White" 
        HorizontalAlign="Left" />
     </asp:Calendar>
      <br/>
      <asp:Label id="lblCount" runat="server" />
      <br/>
      <asp:Label id="lblTodaysDate" runat="server" />
      <br/>
      <asp:Label id="lblSelected" runat="server" />
      <br/>
      <table>
         <tr>
            <td>
               Select a month:
            </td>
            <td>
               <asp:DropDownList 
                  id= "ddl"
                  AutoPostBack="true"
                  onSelectedIndexChanged = "ddl_SelectedIndexChanged"
                  runat="server">
                  <asp:ListItem text="January" value="1" />
                  <asp:ListItem text="February" value="2" />
                  <asp:ListItem text="March" value="3" />
                  <asp:ListItem text="May" value="5" />
                  <asp:ListItem text="June" value="6" />
                  <asp:ListItem text="July" value="7" />
                  <asp:ListItem text="August" value="8" />
                  <asp:ListItem text="September" value="9" />
                  <asp:ListItem text="October" value="10" />
                  <asp:ListItem text="November" value="11" />
                  <asp:ListItem text="December" value="12" />
               </asp:DropDownList>
            </td>
            <td>
               <asp:Button
                  id="btnTgif"
                  text="TGIF"
                  onClick="btnTgif_Click"
                  runat="server" />
            </td>
         </tr>
         <tr>
            <td colspan="2">&nbsp;</td>
         </tr>
         <tr>
            <td colspan="2"><b>Day Range</b></td>
         </tr>
         <tr>
            <td>Starting Day</td>
            <td>Ending Day</td>
         </tr>
         <tr>
            <td>
               <asp:TextBox id= "txtStart"  runat="server"
                  Width="25"
                  MaxLength="2" />
            </td>
            <td>
               <asp:TextBox id= "txtEnd" runat="server"
                  Width="25"
                  MaxLength="2" />
            </td>
            <td>
               <asp:Button id="btnRange" runat="server" 
                  text="Apply"
                  onClick="btnRange_Click" />
            </td>
         </tr>
      </table>
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
     if (!IsPostBack)
     {
       Calendar1.VisibleDate = Calendar1.TodaysDate;
       ddl.SelectedIndex = Calendar1.VisibleDate.Month - 1;
     }
     lblTodaysDate.Text = "Today"s Date is " + Calendar1.TodaysDate.ToShortDateString();
   }
  protected void Calendar1_SelectionChanged(object sender, EventArgs e)
   {
     lblSelectedUpdate();
     lblCountUpdate();
     txtClear();
   }
  private void lblSelectedUpdate()
  {
    if (Calendar1.SelectedDate != DateTime.MinValue)
      lblSelected.Text = "The date selected is " +
      Calendar1.SelectedDate.ToShortDateString();
  }
  private void lblCountUpdate()
  {
    lblCount.Text = "Count of Days Selected:  " +
      Calendar1.SelectedDates.Count.ToString();
  }
  protected void ddl_SelectedIndexChanged(Object sender, EventArgs e)
  {
    Calendar1.SelectedDates.Clear();
    lblSelectedUpdate();
    lblCountUpdate();
    Calendar1.VisibleDate = new DateTime(Calendar1.VisibleDate.Year,
                Int32.Parse(ddl.SelectedItem.Value), 1);
    txtClear();
  }
  protected void btnTgif_Click(Object sender, EventArgs e)
  {
    int currentMonth = Calendar1.VisibleDate.Month;
    int currentYear = Calendar1.VisibleDate.Year;
    Calendar1.SelectedDates.Clear();
    for (int i = 1; i <= System.DateTime.DaysInMonth(currentYear,currentMonth); i++)
    {
      DateTime date = new DateTime(currentYear, currentMonth, i);
      if (date.DayOfWeek == DayOfWeek.Friday)
        Calendar1.SelectedDates.Add(date);
    }
    lblSelectedUpdate();
    lblCountUpdate();
    txtClear();
  }
  protected void btnRange_Click(Object sender, EventArgs e)
  {
    int currentMonth = Calendar1.VisibleDate.Month;
    int currentYear = Calendar1.VisibleDate.Year;
    DateTime StartDate = new DateTime(currentYear, currentMonth,
                  Int32.Parse(txtStart.Text));
    DateTime EndDate = new DateTime(currentYear, currentMonth,
                 Int32.Parse(txtEnd.Text));
    Calendar1.SelectedDates.Clear();
    Calendar1.SelectedDates.SelectRange(StartDate, EndDate);
    lblSelectedUpdate();
    lblCountUpdate();
  }
  private void txtClear()
  {
    txtStart.Text = "";
    txtEnd.Text = "";
  }
  protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
  {
    if (!e.Day.IsOtherMonth && e.Day.IsWeekend)
      e.Cell.BackColor = System.Drawing.Color.LightGreen;
    if (e.Day.Date.Month == 1 && e.Day.Date.Day == 1)
      e.Cell.Controls.Add(new LiteralControl("<br/>Happy New Year!"));
  }
  protected void Calendar1_VisibleMonthChanged(object sender, MonthChangedEventArgs e)
  {
    if ((e.NewDate.Year > e.PreviousDate.Year) ||
      ((e.NewDate.Year == e.PreviousDate.Year) &&
      (e.NewDate.Month > e.PreviousDate.Month)))
      lblMonthChanged.Text = "My future"s so bright...";
    else
      lblMonthChanged.Text = "Back to the future!";
    Calendar1.SelectedDates.Clear();
    lblSelectedUpdate();
    lblCountUpdate();
    txtClear();
  }
}
Источник — «http://nfex.ru/index.php?title=ASP.Net/Asp_Control/Calendar&oldid=2151»