ASP.NET Tutorial/HTML Controls/Text input

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Read input from text field, do calculation then output to the save page (C#)

   <source lang="csharp">

File: Default.aspx

<%@ Page Language="C#" AutoEventWireup="true"

   CodeFile="Default.aspx.cs" Inherits="CurrencyConverter" %>

<!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>
   <title>Currency Converter</title>
 </head>
 <body>
   <form ID="Form1" method="post" runat="server">
       Convert:
       <input type="text" ID="US" runat="server"/>U.S. dollars to
       <select ID="Currency" runat="server" />
       

<input type="submit" value="OK" ID="Convert" runat="server" OnServerClick="Convert_ServerClick" /> <input type="submit" value="Show Graph" ID="ShowGraph" runat="server" OnServerClick="ShowGraph_ServerClick" />

<img ID="Graph" alt="Currency Graph" scr="" runat="server" />

   </form>
 </body>

</html>

File: Default.aspx.cs using System; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; public partial class CurrencyConverter : System.Web.UI.Page {

 protected void Page_Load(Object sender, EventArgs e)
 {
   if (this.IsPostBack == false)
   {
     Currency.Items.Add(new ListItem("Euros", "0.5"));
     Currency.Items.Add(new ListItem("Japanese Yen", "100"));
     Currency.Items.Add(new ListItem("Canadian Dollars", "2"));
   }
   Graph.Visible = false;
 }
   protected void Convert_ServerClick(object sender, EventArgs e)
   {
       decimal amount;
       bool success = Decimal.TryParse(US.Value, out amount);
       if (success)
       {
           ListItem item = Currency.Items[Currency.SelectedIndex];
           decimal newAmount = amount * Decimal.Parse(item.Value);
           Result.InnerText = amount.ToString() + " U.S. dollars = ";
           Result.InnerText += newAmount.ToString() + " " + item.Text;
       }
       else
       {
           Result.InnerText = "The number you typed in was not in the correct format. ";
           Result.InnerText += "Use only numbers.";
       }
   }
   protected void ShowGraph_ServerClick(object sender, EventArgs e)
   {
       Graph.Src = "Pic" + Currency.SelectedIndex.ToString() + ".png";
       Graph.Visible = true;
   }

}</source>


Set value to html:textbox in page load event (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <script runat="server">

  sub Page_Load(Sender as object, e as EventArgs)
     tbMyText.Value = "This is the page load event!"
  end sub

</script> <html><body>

  <form runat="server">
     <input type="text" size="25" 
        id="tbMyText" runat="server" />
  </form>

</body></html></source>


TextBox server changed event

   <source lang="csharp">

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ChangeEvents" %> <!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>Change Events</title>

</head> <body>

   <form id="form1" runat="server" >
       <select runat="server" 
               id="List1" 
               size="5" multiple 
               Name="List1" 
               onserverchange="List1_ServerChange">
       <option>Option 1</option>
       <option>Option 2</option>
   </select>
   
<input type="text" runat="server" ID="Textbox1" Size="10" Name="Textbox1" OnServerChange="Ctrl_ServerChange">
<input type="checkbox" runat="server" ID="Checkbox1" Name="Checkbox1" OnServerChange="Ctrl_ServerChange">Option text
  <input type="submit" runat="server" ID="Submit1" Name="cmdSubmit" value="Submit Query" onserverclick="Submit1_ServerClick">
   </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 ChangeEvents : System.Web.UI.Page {

 protected void Page_Load(object sender, System.EventArgs e)
 {
   if (!Page.IsPostBack)
   {
     List1.Items.Add("Option 3");
     List1.Items.Add("Option 4");
     List1.Items.Add("Option 5");
   }
 }
 protected void Ctrl_ServerChange(object sender, System.EventArgs e)
 {
Response.Write("
  • ServerChange detected for " + sender + "
  • ");
     }
     protected void List1_ServerChange(object sender, EventArgs e)
     {
    
    Response.Write("
  • ServerChange detected for List1. " + "The selected items are:

  • ");
       foreach (ListItem li in List1.Items)
       {
         if (li.Selected)
           Response.Write("  - " + li.Value + "
    "); } } protected void Submit1_ServerClick(object sender, EventArgs e) {
    Response.Write("
  • ServerClick detected for Submit1.
  • ");
     }
    

    }</source>