int[] arr = new int [10];
            for (int i = 0; i < arr.Length; i++)
            {
                Console.Write("a[{0}]=", i);
                arr[i] = Convert.ToInt32(Console.ReadLine());
            }
            Console.WriteLine("Mang ");
            for (int i = 0; i < arr.Length; i++)
                Console.Write("{0}, ", arr[i]);
            Console.WriteLine("\nMang sau sap xep: ");
            Array.Sort(arr);//sap xep mang
            for (int i = 0; i < arr.Length; i++)
                Console.Write("{0}, ", arr[i]);