SelectedIndexChanged not event firing on DropDownList when changed programatically

[Rob]

Hi,

We have a custom control which contains a number of dropdownlists. Within
the custom control class we have a handler for the SelectedIndexChanged
event. This event fires when the user selects an item from the dropdownlist,
but it's not firing when we change the selected value in the custom
control's properties. It changes the selected value successfully, but no
event is fired.

In addition to this, changing the selection in one dropdownlist causes the
available selections in the other dropdownlist to change. This is working
successfully, however, when I attempt to access the new list, I'm unable to
because it's still holding the old values.

Can anybody tell me what I might be doing wrong. Unfortunately I can't
provide any code snippets because I'm writing this post from home

Thanks

 

[Teemu Keiski]

Hi,

that's by design if I understand your description correctly. ASP.NEt throws
events only based on user interaction, e.g when user has changed the
selection on the browser e.g at client. But if you change it
programmatically (in server-side code), no event is fired.

It's explained in

ASP.NET Web Server Control Event Model
http://msdn2.microsoft.com/en-us/library/y3bwdsh3.aspx