selectedIndex is lost during postbacks - ASP.NET

Question

I have a list box control:

The code behind resembles:

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Answer 1

It looks to me like you are creating a new eventhandler on each page load. This might be causing the problem. Why not attach the eventhandler declaratively:

also, why not reference the control directly, instead of casting?

protected void lbox_SelectedIndexChanged(object sender, EventArgs e)
{
    int index = lbox.selectedIndex;
}