ASP.Net DropDownList OnSelectedIndexChange not firing

Question

I have the following DropDownList control:

Answer 1

AutoPostBack="true" and

write page load event

if (!IsPostBack)
{
   DDL_Designation_Bind();   
}

// Because autopostback properties fire load event then our dropdownlist rebind and always selected index 0 so Not Rebinding dropDownlist

Answer 2

Add this to dropdown list aspx it will cause a request to be send to the server and your event will be fired.

AutoPostBack="true"

Answer 3

Set AutoPostBack=True as an attribute of your DDL and it will automatically post back the selected index change event

Answer 4

You just need to set AutoPostBack = True

From ListControl.AutoPostBack property;

Gets or sets a value indicating whether a postback to the server automatically occurs when the user changes the list selection.