using extension methods on int

Question

I\'m reading about extension methods, and monkeying around with them to see how they work, and I tried this:

namespace clunk {
    public static class oog {
             


        

Answer 1

Console.WriteLine(5.doubleMe());

is equivalent to

Console.WriteLine(oog.doubleMe(5));

Given that, you can see why if ( 7 ) doesn't work.

Extension methods are nothing more than syntax.

As a side note since it is syntax you can call extension methods on null variables because it translates to a normal method call, and methods can take null parameters.