Ex, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var array = new int[,]
            {
                { 1, 2, 3 },
                { 4, 5, 6 },
                { 7, 8, 9 },
                { 10, 11, 12 },
                { 13, 14, 15 },
                { 16, 17, 18 },
                { 19, 20, 21 }
            };
            
            Random rnd = new Random();

Shuffle(rnd, array);
            for (int h = 0; h < array.GetUpperBound(0) + 1; ++h)
            {
                for (int w = 0; w < array.GetUpperBound(1) + 1; ++w)
                {
                    Console.Write(array[h, w]);
                    Console.Write(" ");
                }
                Console.WriteLine();
            }
        }
        
        public static void Shuffle(Random random, int[,] arr)
        {
            int height = arr.GetUpperBound(0) + 1;
            int width = arr.GetUpperBound(1) + 1;

for (int i = 0; i < height; ++i)
            {
                int randomRow = random.Next(i, height);
                for (int j = 0; j < width; ++j)
                {
                    int tmp = arr[i, j];
                    arr[i, j] = arr[randomRow, j];
                    arr[randomRow, j] = tmp;
                }

}
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,22 sec, absolute running time: 0,08 sec, cpu time: 0,11 sec, average memory usage: 14 Mb, average nr of threads: 3, absolute service time: 0,36 sec