Basic App: Lock/Encrypt Folder (AES, Drag Drop)

Hi, I'm looking for an experienced NET developer who can program a basic program that can encrypt folders using AES encryption. Another feature is that it can put a password on folders that can still be accessed by people with the password. The features should be accessible via the context menu or a drag and drop field on the application dashboard Budget for this app is $200 - so this should be rather simple and if it works well we can work on additional features Looking forward to your bids, Oliver