从一个整数数组中取出最大,最小的整数和总和

int[] a = { 12, 2, 99, 6, 1 ,0};
            int Max = 0;
            int Min = 0;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] > Max)
                {
                    Max = a[i];
                }
                if (a[i] < Max)
                {
                    Min = a[i];
                }
            }
            int All = Max + Min;
            Console.WriteLine(Max);
            Console.WriteLine(Min);
            Console.WriteLine(All);
            Console.ReadKey();