Reverse a string in C#.NET

using System; namespace Learn {     class Program     {         static void Main(string[] args)         {             string Str, Revstr = "";             int Length;             Console.Write("Enter A String : ");             Str = Console.ReadLine();             Length = Str.Length - 1;                         while (Length >= 0)             {                 Revstr = Revstr + Str[Length];                 Length--;             }             Console.WriteLine("Reverse  String  Is  {0}", Revstr);             Console.ReadLine();         }     } }