Rob Miles

Oh, and one other thing. There is a convention that the name of the file which contains a particular class should match the class itself, in other words the program above should be held in a file called GlazerCalc.cs.

void

A void is nothing. In programming terms the void keyword means that the method we are about to describe does not return anything of interest to us.

Except for Main. This method (and there must be one, and only one such method) is where your program starts running.