程序代码：

            int[,] a = new int[3,5]{{0,1,2,3,4},{10,11,12,13,14},{20,21,22,23,24}};
            int[] b = new int[15];
            int i = 0;
            foreach (int num in a)
            {
                b[i++] = num;
            }
            for (i = 0; i < b.Length; i++)
                Console.Write(b[i].ToString() + " ");
            Console.ReadKey();