using System;

​

public static class Ok

{

     public class Wowa

     {

         public Wowa() { }

         public static string MyStaticMethod() => "Hello from 'Static Method'";

         public string MyNormalMethod() => "Hello from 'Normal Method'";

     }

}

​

​

public class Program

{

    public static void Main()

    {

          Ok.Wowa wowa = new Ok.Wowa(); //made instance of non-static class

          Console.WriteLine(wowa.MyNormalMethod());              //calling not-static method of non-static class.

          Console.WriteLine(Ok.Wowa.MyStaticMethod());       //calling a static method of non-static class without making instance.

    }

}