nested class in C#

Nested class in C# are static class.
```
using System;
 
public class A {
    public class B {
        public void f() {
            Console.WriteLine("Inner class Method");
        }
    }
}
 
public class MainClass {
    static public void Main() {
        A.B b = new A.B();
        b.f();
    }
}
```