C# Carpets

using System;
using System.Text;

class Program
{
    static void Main()
    {
        int n = 12;
        int midl = n / 2;
        StringBuilder lineLeft = new StringBuilder();
        StringBuilder lineRight = new StringBuilder();
        for (int i = 0; i < midl; i++)
        {
            if (i % 2 == 0)
            {//tish condition mark shen to ad space or slashes padding fil out the rest
                lineLeft.Append("/"); lineRight.Insert(0, '\\');
                Console.WriteLine(lineLeft.ToString().PadLeft((midl), '.') + lineRight.ToString().PadRight((midl), '.'));
            }
            else if (i % 2 == 1)
            {
                lineLeft.Append(" "); lineRight.Insert(0, ' ');
                Console.WriteLine(lineLeft.ToString().PadLeft((midl), '.') + lineRight.ToString().PadRight((midl), '.'));
            }
        }
        // change slashes direction
        lineLeft.Replace('/', '\\'); lineRight.Replace('\\', '/');
        Console.WriteLine(lineLeft.ToString().PadLeft((midl), '.') + lineRight.ToString().PadRight((midl), '.'));

        for (int i = 0; i < midl-1; i++)
        { // just remove inner element from the carpet padding fill up the rest wit dots. to lineLeft inner element is the last one
            // for lineRightinner element is the first - zero element.
            lineLeft.Remove(lineLeft.Length - 1, 1); lineRight.Remove(0, 1);
            Console.WriteLine(lineLeft.ToString().PadLeft((midl), '.') + lineRight.ToString().PadRight((midl), '.'));
        }
    }
}