Reverse Array Without using Reverse Function

class Program
{
   static void Main(string[] args)
   {
      int[] arr = new int[] { 1, 2, 3, 4, 5 };
      int length = arr.Length - 1;
      string strReverse = null;
      while (length >= 0)
      {
         strReverse = strReverse + arr[length];
         length--;
      }
      Console.WriteLine();
      Console.WriteLine("Reverse Array is "+" "+strReverse);
      Console.ReadLine();
   }
}