selectedIndex is lost during postbacks - ASP.NET

Question

I have a list box control:

The code behind resembles:

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Answer 1

I dont know if it makes a difference or not, but i generally attach my controls to events on the front page rather than in the codebehind. In your example i would have done:

Other than that, i would verify that the ViewState is enabled. ViewState can be turned of at the control, page, & even site level.