_draw function in C#? and window size in C#

Does the _draw function in GdScript exist in C#? Has it been renamed? Am I just not seeing it?

Also how do I get the window size in C# in GDScript its get_viewport().get_size().

Thanks for the help Ron

public override void _Draw() { //custom drawing here }

//Get viewport size Vector2 vpSize = GetViewport().Size;

Thank you for the reply. Thats what I thought too and tried it before but it throws errors. maybe they are still completing things.