extension method For Console Class

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C#

i want to add an extension method for console class named "WriteLog". i tried like this

using System;
namespace MyName
{
  static class MyName
  {
     public static void WriteLog(this Console c)
     {
        Console.WriteLine("Hello");
     }
  }
}

now i am using this by namespace but its not showing in console class...

pls tell me where i am wrong.........