Similar to Can I limit users to a specific range and zoom level on Google Maps? except with Bing Maps.
I don’t see anything in the API for it specifically, so I’m not sure that it is easily done without overriding some method (and I don’t know which one at that). I’m only working in javascript, not silverlight or any serverside technology.
It can be done, but they don’t make it easy. You need to listen to the mouse move event.