for (int i = 1; i <= 8; i++)

            {

                int a, b;

                for (a = 1; a < i; a++)

                    Console.Write(" ");

                for (b = 8; b >= i; --b)

                    Console.Write("*");

                Console.WriteLine();

            }

            Console.ReadLine();

for (int i = 1; i <= 8; i++)

            {

                int a, b, c;

                for (a = 8; a > i; a--)

                    Console.Write(" ");

                for (b = 1; b <= i; b++)

                    Console.Write("*");

                for (c = 1; c < i; c++)

                    Console.Write("*");

                Console.WriteLine();

            }

            for (int i = 1; i <= 7; i++)

            {

                int a, b, c;

                for (a = 1; a <= i; a++)

                    Console.Write(" ");

                for (b = 7; b >= i; b--)

                    Console.Write("*");

                for (c = 7; c > i; --c)

                    Console.Write("*");

                Console.WriteLine();

            }

            Console.ReadLine();