Your question is Build ASP.NET MVC Autocomplete. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Build a simple ASP.NET MVC v2 website with a textbox that provides autocomplete like a Google search page, using a hardcoded server-side data source and a save button to persist user selections on the server side.