lock

I am currently working on an app (using VB.NET & Silverlight). The app does several calculations, and they usually work fine. However, on occasion (maybe 1out of 10 times), the app locks up when I click one of the buttons. This happens regardless of whether I am running it using Deploy or Debug...

I have an application where I'm allowing the user to edit the text of a treeview node. Is it possible to "lock" portions of the node's text to keep it from being edited? For instance, if the text is "BK01" originally, can I keep the user from editing the "BK" prefix? I currently validate the...