Collection was modified; enumeration may not execute error when removing a ListItem from a LIstBox

Question

I have two ListBoxes, lstAvailableColors and lstSelectedColors. Between each listbox are two buttons, Add and Remove. When a color or colors is selected in lstAvailableCol

Answer 1

You cannot modify a collection you are iterating on. In general, a good solution for this type of problem is to create an empty collection, and in your iterator, copy over all of the elements you do NOT want to remove; after the iteration is complete, replace the original collection with your new collection.