C#产生二维随机数

 Random r = new Random();
            int[,] arr = new int[3, 3];
            for (int i = 0; i < 3; i++) {
                for (int j = 0; j < 3; j++)
                {
                    arr[i, j] = r.Next(10, 60);//10-60之间
                    Console.Write(arr[i, j].ToString() + " ");
                }
                Console.WriteLine();
            }