Custom Controls ASP.Net Tutorial

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<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Register Src="Control.ascx" TagName="VaryByControl" TagPrefix="uc1" %>



    Untitled Page


    
    

        
    
    

    


File: Control.ascx
<%@ Control Language="C#" 
            AutoEventWireup="true" 
            CodeFile="Control.ascx.cs" 
            Inherits="VaryByControl" %>
<%@ OutputCache Duration="30" VaryByControl="lstMode"  %>

  Large
  Small
  Medium
 
Control generated at: 

File: Control.ascx.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 VaryByControl : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
    switch (lstMode.SelectedIndex)
    {
      case 0:
        TimeMsg.Font.Size = FontUnit.Large;
        break;
      case 1:
        TimeMsg.Font.Size = FontUnit.Small;
        break;
      case 2:
        TimeMsg.Font.Size = FontUnit.Medium;
        break;
    }
    TimeMsg.Text = DateTime.Now.ToString("F");
    }
}