Dynamically Generated DropDownList in GridView Lose Selected Values On PostBack

Posted on 2008-02-01
Medium Priority
Last Modified: 2013-11-07
I'm generating dropwdownlists(ddl) in a gridview using ITemplate. When selections are made in the ddls
and the form is submitted the form builds before the OnRowCommand or submit button event handlers are fired. How can I access the the selected values on PostBack?
Question by:wsmith5204
  • 2
LVL 18

Accepted Solution

Joel Coehoorn earned 2000 total points
ID: 20799861
Whenever you have a dynamically generated control of any type that loses state on postback, it almost always comes down to a page lifecycle problem.

In a nutshell, your page is recreated from scratch every time it reloads, including on postback.  This means you have to re-create your dynamic controls as well.  One of the things that happens while the page loads is to bind state information for each control on the page.  However, it can only do this if the control already exists at that point in the life cycle.  So what's likely happening is that you aren't re-creating your dynamic control early enough in the page lifecycle for the state information get loaded.

These links really helped me understand the problem when I first ran into it:

Author Comment

ID: 20800053
I'm generating the controls in the OnInit() method. Is the an earlier point in the page lifecycle I can generate them (pre-init)?
LVL 18

Expert Comment

by:Joel Coehoorn
ID: 20800381
IIRC, OnInit is the correct place, ASP.Net 2.0 has a PreInit, and ASP.Net 1.1 does not.  

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