Pattern-1:

output:

    1
   121
  12321
 1234321
123454321

Code:

            int nu = 5;
            for (int i = 1; i <= nu; i++)
            {
                int kk = ((nu-i) +(nu - i)) / 2;
                for (int y = 0; y < kk; y++)
                {
                    Console.Write(" ");
                }

                for (int j = 1; j <= i; j++)
                {
                    Console.Write(j);
                }
                for (int j = i - 1; j > 0; j--)
                {
                    Console.Write(j);
                }

                for (int y = 0; y < kk; y++)
                {
                    Console.Write(" ");
                }
                Console.WriteLine();
            }