Square design program in C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication7

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.Write("Enter the number: ");

            int num = Convert.ToInt32(Console.ReadLine());

            for (int j = 1; j <= num; j++)

            {

                Console.Write("*");

            }

            for (int l = 1; l <= num - 2; l++)

            {

                Console.WriteLine("");

                for (int m = 1; m <= 1; m++)

                {

                    Console.Write("*");

                }

                for (int o = 1; o <= num - 2; o++)

                {

                    Console.Write(" ");

                }

                for (int p = 1; p <= 1; p++)

                {

                    Console.Write("*");

                }

            }

            Console.WriteLine("");

            for (int q = 1; q <= num; q++)

            {

                Console.Write("*");

            }

            Console.WriteLine("");

            Console.ReadKey();

        }

    }

}

Output:

Enter the number: 5

*****

*   *

*   *

*   *

*****