Why selected item in ListBox throws error in expression blend?

You are almost always better binding to the SelectedItem than the SelectedIndex. If the Item is null, the binding should fail gracefully.

I agree, SelectedItem does fail gracefully. – Nair Jun 16 at 13:47.

This is probably because the "Collection" attribute gets bound to the itemsource after the listbox is rendered. So if there is no collection(empty) then the first index 0 does not exist and it throws an "out of range exception". To resolve your issue set the selected index in code-behind after collection is populated.

Hope that helps.

That's a really nice explanation of why the error is occurring. However, I think Joel's answer of binding to SelectedItem is a better way to go. – Mike Post Jun 17 at 16:00 Agreed Mike.

Thanks – Zahid Sattar Jun 17 at 16:42.

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