mithilesh kumar singh

  class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Enter the row number");

            int n = int.Parse(Console.ReadLine());

            for (int row = 1; row <= n * 2 - 1; row++)

            {

                for (int coll = 1; coll <= n * 2 - 1; coll++)

                {

                    if (row == 1 || row == n * 2 - 1 || coll == 1 ||

                        coll == n * 2 - 1 || coll == 2 * n / 2 - row + 1 || row + n - 1 == coll

                        || coll + n - 1 == row || coll + 2 * n - 1 == row + n || row + 1 - n == 2 * n - coll)

                    {

                        Console.Write("*" + " ");

                    }

                    else

                    {

                        Console.Write("  ");

                    }

                }

                Console.WriteLine();

            }

            Console.ReadLine();

        }

    }