int max=0;
            int[,] C = new int[3, 3] { { 1, 2, 5 }, { 6, 4, 8 }, { 6, 9, 4 } };
            for (int i = 0; i < C.GetLength(0); i++)
            {
                for (int j = 0; j < C.GetLength(1); j++)
                {
                    Console.Write("{0}\t", C[i, j]);
                }
                Console.WriteLine();
            }
            int tmp = 0;
            
            int jmax = 0;
            Console.WriteLine();
            for (int i = 0; i < C.GetLength(0); i++)
            {
                max = 0;
                jmax = 0;
                for (int j = 0; j < C.GetLength(1); j++)
                {
                    if (C[i, j] > max)
                    {
                        max = C[i, j];
                        jmax = j;
                    }
                }

                Console.WriteLine(max);
                tmp = C[i, jmax];
                C[i, jmax] = C[i, 0];
                C[i, 0] = tmp;
            }
                Console.WriteLine ();
                for (int i = 0; i < C.GetLength(0); i++)
                {
                    for (int j = 0; j < C.GetLength(1); j++)
                    {
                        Console.Write("{0}\t", C[i, j]);
                    }
                    Console.WriteLine();
                }