Invalid operation Exception on selectedindexchange event of combo box in C#

[kalaveer]

On changing the index of the combo box giving the following exception Invalid operation Exception: List that this enumerator is bound to has been modified. An enumerator can only be used if the list does not change. why this exception is coming pls help me!

[originSH]

Somewhere in that code your enumerating through a collection. Whilst you are doing this you cannot change the enumeration in any way. If you do you'll get that error.