DrawSquare recursion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Draw_Filied_Square
{
    class Program
    {
        static void PrintLineHeaderFooter(int numValue)
        {
            Console.WriteLine(new string('-',2*numValue));
        }

        static void PrintLineMiddle(int num,int valueCurrentRow)
        {
            if (valueCurrentRow==0)
            {
                return;
            }
            else
            {
                Console.Write('-');
                for (int i = 1; i < num; i++)
                {
                    Console.Write("\\/");
                }
                Console.WriteLine('-');
                PrintLineMiddle(num, valueCurrentRow - 1); ;
            }
        }

        static void Main()
        {
            int number = int.Parse(Console.ReadLine());
            int currentRow = number-2;
            PrintLineHeaderFooter(number);
            PrintLineMiddle(number,currentRow);
            PrintLineHeaderFooter(number);

        }
    }
}