C# full screen console?
In older versions of Windows you could put any console into full screen with Alt-Enter
(if I remember correctly).
With the introduction of the Desktop Window Manager and full screen composition via the GPU in Vista that full screen console window function was removed.
(When updating the graphics driver the graphics subsystem is being reset, what you see isn't a console window, but the graphics card default startup into text mode.)
Windows 7 does not support Full Screen console applications. On XP you can use SetConsoleDisplayMode, you will need to P/Invoke to this, but it is relatively simple. I know on win 7 x64 this function will fail with error 120 This function is not spported on this system
To get the console handle you can use some of the code from this answer.