Traversing the ASP.NET Control Tree with LINQ

Many users of ASP.NET has over the years created various helper classes and utilities to simplify traversing the ASP.NET Control structure. It turns out that LINQ enables us to apply some powerful querying on top of ASP.NET and in many cases with simple one liners. Using Linq directly makes code alot easier to read. Here's an example of how using Linq to validate if a Question is answered correctly just to show the power of the syntax.