You can select Class View or Object Browser from the View menu and this will show you all classes and the methods within those classes for your project or solution.
If you are looking for a view of external dependencies for a particular class then I believe that you can generate a dependency graph if you have the Visual Studio Ultimate edition.
I have never tried this so I can make no guarantees on this.
Other tools are available such as .NET Reflector that can help give you an overview of what your application is doing.
Perhaps other users have some ideas of additonal tools that may be helpful in this area?