using System;

namespace SomeNameSpace

{

    public class MyClass 

    {

        public static void Main() 

        {

           int a = Nested.NestedNameSpaceClass.SayHello();

            Console.WriteLine(a);

            string name= "anson";

            Nested1.NestedNameSpaceClass2.SayHai(name);

        }

    }

​

    // a nested namespace

    namespace Nested   

    {

        public class NestedNameSpaceClass 

        {

            public static int SayHello() 

            {

                int a =10;

                return a;

            }

        }

    }

    namespace Nested1

    {

     public class NestedNameSpaceClass2

     {

       public static void SayHai(string name)

       {

         Console.Write("Hi "+name);

           Console.Write(",how are you ?");

       }

     }

    }

}