Assign a value to each element in Imagelist

Could you please speciy what you mean with "Duplicate Images"?

Do they have the same path? The same contents? If same contents, is the similarity down to the byte level or is it only that they look identical to the human eye?

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Let's talk about MVVM: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b1a8bf14-4acd-4d77-9df8-bdb95b02dbe2