Quickest Method to Reverse in String in C#.net

Question

I\'m currently writing a quick solution for Euler Problem #4 where one must find the largest palindromic number from the product of two 3-digit numbers.

To identify if a

Answer 1

public static String Reverse(string input) {
  var length = input.Length;
  var buffer = new char[length];
  for ( var i= 0; i < input.Length; i++ ) {
    buffer[i] = input[(length-i)-1];
  }
  return new String(buffer);
}

EDIT: Doh! Forgot to halve the length for perf :)