C# Int/Void Error? Help!!!!?

Hey guys, i'm a newbie to programming (I know almost everything about computers BUT programming). I have taken up c# as of about a week ago lol. However, whenever i try to write a program, whether it be a window form or a command prompt program, whenever i declare a namespace, if that line of code includes int (or sometimes void) it give me an error (and underlines int in red) and says "expected cl, delegate, enum, interface, or struct". Am i doing something wrong? I can't figure it out so help is much appreciated.