how to find SelectedIndexChanged event of a dropdownlist in c#

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Hi guys,

i have asp.net web application using c#.

Where i have created one web user control, in this web user control i have dropdowlist and textboxes,
and also i have dropdownlist selectedindexchanged event in this web user control.

i'm using this web user control in a repeater.

i'm able to find all the controls i had in the web user control.

But how can i find the dropdownlist selectedIndexChanged event.

Please, suggest me.

Thanks

Posted 30-Aug-14 7:21am

abdul subhan mohammed

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DineshMaind · Answer 1 · 2014-08-30T10:32:00

Define a specific event for that control. Let you have a user control TestUserControl.ascx having dropdownlist as uxDemoList allow AutoPostBack="true" for uxDemoList control. In code behind your code can be stated bellow.

C#

public delegate void SelectedIndexChangedHandler(object sender, EventArgs e);
public event SelectedIndexChangedHandler SelectedIndexChanged;

protected void uxDemoList_SelectedIndexChanged(object sender, EventArgs e)
{
    if (SelectedIndexChanged != null)
    {
        SelectedIndexChanged(sender, e);
    }

    Response.Write("<br />In User Control.");
}

Now add this control in aspx page say TestPage.aspx as shown below.

ASP.NET

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestPage.aspx.cs" Inherits="TestPage" %>
<%@ Register Src="~/TestUserControl.ascx" TagPrefix="uc" TagName="List" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <uc:list id="uxUcList" runat="server" onselectedindexchanged="uxUcList_SelectedIndexChanged" />
    </div>
    </form>
</body>
</html>

Its code behind will be.

C#

protected void uxUcList_SelectedIndexChanged(object sender, EventArgs e)
{
    Response.Write("<br />In Page.");
}

Try this demo it will be clear when using it.