ASPX ListBox AutoSelect Not "Working"

Sorry do you mean that when you auto-select the first item in your list you expect your (I assume you have from what you imply), your selection change event to be called? If so you are mistaken as to what you are doing. Selecting an item in server rendering code (in the Page_Load event) does not cause (and physically cannot cause) a post back and so not event gets fired - just think about the request lifecycle! Where as the user (you) selecting the first item (regardless of what was selected before) does cause a post back from client (you) to the server where your event is then fired. If you want to run code after auto-selecting the first item, you will have to call your method after selecting the item in the Page_Load event.

Ed

mention autopostback= true ...

If u clarify your problem with some code snippets