Array lowerbound and upperbound

using System;/*from   j  av  a  2  s  .  co m*/

public class MainClass
{
    static void Main() {
        int[,] twoDim = { {1, 2, 3},
                          {4, 5, 6},
                          {7, 8, 9} };

        for( int i = twoDim.GetLowerBound(0);i <= twoDim.GetUpperBound(0);++i ) {
            for( int j = twoDim.GetLowerBound(1);j <= twoDim.GetUpperBound(1);++j ) {
                Console.WriteLine( twoDim[i,j] );
            }
        }
    }
}