DropDownList's SelectedIndexChanged event is not triggered

cpp_prgmer

I read several posts online & verified the following: 1. AutoPostBack="true" 2. EnableViewState="True" (default) 3. CausesValidation = "False" (default) Also added the EnableViewState="true" on the page-level directive. Inspite of this I am unable to cause the SelectedIndexChanged event to trigger. I am using VS2010, VB.NET with no AJAX. I am populating my dropdownlist in the PageLoad event and on the condition If (Not IsPostback) Another issue is that my dropdownlist items are getting cleared on postback each time. So as a work around I added SQLDataSource on my aspx page and configured it as datasource to my dropdownlist and now the event is getting triggered properly, I am not sure why. I am new to VB.NET and web development and I feel I am missing something obvious, like taking into consideration Page events chronology, please suggest. Thanks for all your help in advance.

<%@ Page Title="" Language="VB" MasterPageFile="~/MyMaster.master" AutoEventWireup="false" CodeFile="MyPage.aspx.vb" Inherits="MyPage" EnableViewState="true" %>

Title

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration.ConfigurationManager

Partial Class MyPage Inherits System.Web.UI.Page
Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
If IsPostBack Then
Exit Sub
End If
PopulateData()
End Sub

Private Sub PopulateData()
    Dim da As New SqlDataAdapter
     Dim ds1, ds2, ds3 As New DataSet

    Try
        Using

Parwej Ahamad

You need to bind event "ddl_SelectedIndexChanged" with dropdown list.

Parwej Ahamad

cpp_prgmer

Thanks for the help. But in VB.NET the event handling happens in the code-behind using "Function Handles control.event" kind of signature. You can find that in the code I have posted in my original question.