What is the keyboard shortcut to type fast in Visual Studio?

Pressing Ctrl+Space completes the current variable/class you are typing.

Typing things like ctor and then pressing the Tab key twice tells Visual Studio to insert a constructor for you. (Also works with for for a for loop, cw for a Console.WriteLine();, etc.)

For a full list, please refer to the official reference from MSDN.

I believe its Ctrl-Space, which is pretty common among most IDE's