ASP.NET Tutorial/ASP.net Controls/Border

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Set border style dynamically (C#)

File: Default.aspx
<%@ Page language="c#" Inherits="GreetingCardMaker" CodeFile="Default.aspx.cs" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>Greeting Card Maker</title>
    </head>
  <body>
    <form runat="server">
      <div>
      <div >Choose a background color:<br />
        <asp:dropdownlist ID="lstBackColor" 
                          runat="server" 
                          Height="22px" 
                          Width="194px"></asp:dropdownlist>
        <br /><br />
        Choose a font:<br />
        <asp:dropdownlist ID="lstFontName" 
                          runat="server" 
                          Height="22px" 
                          Width="194px"></asp:dropdownlist>
        <br /><br />
        
        Specify a numeric font size:<br />
        <asp:textbox ID="txtFontSize" runat="server"></asp:textbox>
        <br /><br />
        Choose a border style:<br />
        <asp:radiobuttonlist ID="lstBorder" 
                             runat="server" 
                             Height="59px" 
                             Width="177px" 
                             Font-Size="X-Small"></asp:radiobuttonlist>
        <br /><br />
        <asp:checkbox ID="chkPicture" 
                      runat="server" 
                      Text="Add the Default Picture"></asp:checkbox>
        <br /><br />
        Enter the greeting text below:<br />
        <asp:textbox ID="txtGreeting" 
                     runat="server" 
                     Height="85px" 
                     Width="240px" 
                     TextMode="MultiLine"></asp:textbox>
        <br /><br />
        <asp:button ID="cmdUpdate" 
                    runat="server" 
                    Height="24px" 
                    Width="71px" 
                    Text="Update" 
                    onclick="cmdUpdate_Click"></asp:button>
      </div>
      <asp:panel ID="pnlCard" runat="server" 
      Height="507px" Width="339px" 
                     HorizontalAlign="Center"><br />&nbsp; 
          <asp:Label ID="lblGreeting" 
                     runat="server" 
                     Height="150px" 
                     Width="256px"></asp:Label>
          <br /><br /><br />
          <asp:Image ID="imgDefault" 
                     runat="server" 
                     Height="160px" 
                     Width="212px" 
                     Visible="False"></asp:Image>
        </asp:panel>
        </div>
    </form>
  </body>
</html>
File: Default.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 partial class GreetingCardMaker : System.Web.UI.Page
{
  protected void Page_Load(object sender, System.EventArgs e)
  {
    if (this.IsPostBack == false)
    {
      lstBackColor.Items.Add("White");
      lstBackColor.Items.Add("Red");
      lstBackColor.Items.Add("Green");
      lstBackColor.Items.Add("Blue");
      lstBackColor.Items.Add("Yellow");
      lstFontName.Items.Add("Times New Roman");
      lstFontName.Items.Add("Arial");
      lstFontName.Items.Add("Verdana");
      lstFontName.Items.Add("Tahoma");
            ListItem item = new ListItem();
            item.Text = BorderStyle.None.ToString();
            item.Value = ((int)BorderStyle.None).ToString();
            lstBorder.Items.Add(item);
            item = new ListItem();
            item.Text = BorderStyle.Double.ToString();
            item.Value = ((int)BorderStyle.Double).ToString();
            lstBorder.Items.Add(item);
            item = new ListItem();
            item.Text = BorderStyle.Solid.ToString();
            item.Value = ((int)BorderStyle.Solid).ToString();
            lstBorder.Items.Add(item);
    
      lstBorder.SelectedIndex = 0;
      imgDefault.ImageUrl = "default.png";
    }
  }
  protected void cmdUpdate_Click(object sender, System.EventArgs e)
  {
    pnlCard.BackColor = Color.FromName(lstBackColor.SelectedItem.Text);
    lblGreeting.Font.Name = lstFontName.SelectedItem.Text;
    try
    {
      if (Int32.Parse(txtFontSize.Text) > 0)
      {
        lblGreeting.Font.Size = FontUnit.Point(Int32.Parse(txtFontSize.Text));
      }
    }catch {
    }
    pnlCard.BorderStyle = (BorderStyle)Int32.Parse(lstBorder.SelectedItem.Value);
    if (chkPicture.Checked == true)
    {
      imgDefault.Visible = true;
    }else {
      imgDefault.Visible = false;
    }
    lblGreeting.Text = txtGreeting.Text;
  }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ASP.net_Controls/Border&oldid=3373»