Untitled

using System;

class Program
{
    static void Main(string[] args)
    {
        Random r = new Random();
        int size = r.Next(1, 5);
        int r_size = (4 * size) + 1;
        int mid = (r_size - 1)/2;
        int x, y;

        string[,] array = new string[r_size, r_size];
        for ( y = 0; y < r_size; y++)
        {
            for ( x = 0; x < r_size; x++)
            {
                array[y, x] = "*";
            }
        }

        int point_x = mid + 1;
        int point_y = mid - 1; 
        int walk = 2;
        x = mid + 1;
        y = mid - 1;

        while (x <= array.GetUpperBound(1) && y <= array.GetUpperBound(0))
        {
            for (x = point_x; x > point_x - walk; x--)
            {
                array[y, x] = " ";
            }
            point_x = x;

        for (y = point_y; y < point_y + walk ; y++)
        {
            array[y, x] = " ";
        }
        point_y = y;
        walk = walk + 2;

        for (x = point_x; x < point_x + walk; x++)
        { 
            array[y, x] = " ";
            if (x >= array.GetUpperBound(1))
                    break;
        }
        if (x >=array.GetUpperBound(1))
        {
            if (y >= array.GetUpperBound(0) - 1)
                break;
        }

        point_x = x;

        for (y = point_y; y > point_y - walk; y--)
        {
            array[y, x] = " ";
        }
        point_y = y;
        walk = walk + 2;
    }


        for ( y = 0; y < r_size; y++)
        {
            for ( x = 0; x < r_size; x++)
            {
                Console.Write(array[y, x] + " ");
            }
            Console.WriteLine();
        }