c_sharp_helloworld - programetc @ ウィキ

参考URI
http://ufcpp.net/study/csharp/

using System;
using System.Collections.Generic;
using System.Text;

namespace HelloCsharp00
{

   class Program
   {
       static void Main(string[] args)
       {
           Console.Write("Hello C# world");
       }
   }

}