Create a UserControl named Uc1.ascx (i.e. I have created insided Folder named Controls)
Step 1: Declare a Delegate and Events for it. In my case,i have created for button click and dropdownlist
Step 2: In .aspx page reference it like this :
<%@ Register Src="~/Controls/Uc1.ascx" TagName="Users" TagPrefix="Test" %>
Full Code :
Uc1.ascx
------------
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Uc1.ascx.cs" Inherits="Controls_Uc1" %>
This is User control1
<asp:Button ID="btnButton1" runat="server" Text="Click" OnClick="btnButton1_Click" />
<asp:DropDownList ID="drp1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="drp1_OnSelectedIndexChanged">
<asp:ListItem>One</asp:ListItem>
<asp:ListItem>Two</asp:ListItem>
<asp:ListItem>Three</asp:ListItem>
<asp:ListItem>Four</asp:ListItem>
</asp:DropDownList>
Uc1.ascx.cs
------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Controls_Uc1 : System.Web.UI.UserControl
{
#region DECLRATIONS
public delegate void MyCustomHandler(object sender, EventArgs e); //This is for button click
public event MyCustomHandler SomethingClicked;
public delegate void MyCustomSelectedHandler(object sender, EventArgs e); //This is for Dropdown selected
public event MyCustomSelectedHandler SomethingSelected;
#endregion
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnButton1_Click(object sender, EventArgs e)
{
//tell our parent page which is listening for the event that something was clicked
//this null check and method invoke is the equivalent of raise event in VB
if (SomethingClicked != null)
{
SomethingClicked(sender, e);
}
//do some other work specific to this button in the user control
}
protected void drp1_OnSelectedIndexChanged(object sender, EventArgs e)
{
if (SomethingSelected != null)
{
SomethingSelected(sender, e);
}
}
}
Default4.aspx
---------------------
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" %>
<%@ Register Src="~/Controls/Uc1.ascx" TagName="Users" TagPrefix="Test" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="btn1" runat="server" Text="Load UserControl1" />
<br />
<Test:Users ID="Users1" runat="server"></Test:Users>
</div>
</form>
</body>
</html>
Default4.aspx.cs
----------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default4 : System.Web.UI.Page
{
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
Users1.SomethingClicked += new Controls_Uc1.MyCustomHandler(Users1_ButtonClicked); //Button Click
Users1.SomethingSelected += new Controls_Uc1.MyCustomSelectedHandler(Users1_DropDownSelected); //DropDownList
}
protected void Users1_ButtonClicked(object senders, EventArgs e)
{
ScriptManager.RegisterClientScriptBlock(this, GetType(), "clientkey", "<script>alert('Button1 Clicked');</script>", false);
}
protected void Users1_DropDownSelected(object senders, EventArgs e)
{
ScriptManager.RegisterClientScriptBlock(this, GetType(), "clientkey", "<script>alert('Make Parent Pages Modal Popup visible when UserControls dropdownlist posted back');</script>", false);
}
protected void Page_Load(object sender, EventArgs e)
{
}
}
