Convert String Lower Case and Upper Case using C#

using System;
namespace CSharpFundamentals
{
   class UpperCaseAndLowerCase
   {
      private static void Main(string[] args)
      {
         String msg = " C# is COOL too ";
         Console.WriteLine("Message in Uppercase: {0}", msg.ToUpper());
         Console.WriteLine("Message in lowercase: {0}", msg.ToLower());
      }
   }
}

Message in Uppercase: C# IS COOL TOO  

Message in lowercase: c# is cool too