Error: Collection was modified; enumeration operation may not execute. [ All Languages » ASP.net »  General Errors] Total Hit ( 2622) Rate this article:     Poor     Excellent   Submit Your Question/Comment about this article Rating

This is very common error when you loop collection and try to remove some item inside the loop. If you try code like below it will fail with the following error Collection was modified; enumeration operation may not execute Click here to copy the following block Dim listItem As ListItem For Each listItem In lbxTest.Items    If listItem.Selected = True Then        lbxTest.Items.Remove(listItem)    End If Next Fix (Use reverse loop) To fix the problem use the reverse loop with numeric index to retive the item as shown below. Click here to copy the following block Dim i As Integer For i = lbxTest.Items.Count - 1 to 0 Step -' Looping Backwards1    If lbxTest.Items(i).Selected Then        lbxTest.Items.Remove(i)    End If Next

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