ASP controls in user control : Basics « Custom Controls « ASP.NET Tutorial






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

<%@ Register Src="Control.ascx" TagName="VaryByControl" TagPrefix="uc1" %>

<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <uc1:VaryByControl ID="VaryByControl1" runat="server" />
    
    </div>
    </form>
</body>
</html>

File: Control.ascx

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

<asp:DropDownList id="lstMode" runat="server" Width="187px">
  <asp:ListItem>Large</asp:ListItem>
  <asp:ListItem>Small</asp:ListItem>
  <asp:ListItem>Medium</asp:ListItem>
</asp:DropDownList>&nbsp;<br />


Control generated at:<br /> 
<asp:label id="TimeMsg" runat="server" />


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");
    }

}








14.2.Basics
14.2.1.User control with property
14.2.2.ASP controls in user control
14.2.3.A Web user control file template
14.2.4.Adding controls to the Web user control
14.2.5.Creating control events in a user control (C#)
14.2.6.Creating control events in a user control (VB)
14.2.7.Exposing user control properties (C#)
14.2.8.Exposing user control properties (VB)
14.2.9.Populating user control properties from the host Web page (C#)
14.2.10.Populating user control properties from the host Web page (VB)
14.2.11.Component level variable
14.2.12.Action from user-defined control
14.2.13.Pass parameter from user-defined controls to host page
14.2.14.Calculator component based on page component (VB.net)
14.2.15.Day minder page component
14.2.16.Use custom control in Assembly
14.2.17.Building a simple User control that randomly displays one image
14.2.18.Registering User Controls in the Web Configuration File
14.2.19.Building Fully Rendered Controls