woe is me

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApplication1
{
    struct MetaTile
    {
        public byte topLeft;
        public byte topRight;
        public byte bottomLeft;
        public byte bottomRight;
    }

    public partial class Form1 : Form
    {
        int CurrentTile;
        Bitmap entire = new Bitmap(127, 127);
        Bitmap map16 = new Bitmap(169,169);
        BinaryReader file = new BinaryReader(File.Open("test.bin", FileMode.Open));
        Color[] palDat = new Color[64];
        Bitmap chr = new Bitmap(8, 2048, PixelFormat.Format32bppRgb);
        List<MetaTile> metatiles = new List<MetaTile>();
        byte[] ROM;

        public Form1()
        {
            InitializeComponent();
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            palDat[0] = Color.Black;
            palDat[1] = Color.Wheat;
            palDat[2] = Color.Orange;
            palDat[3] = Color.Black;
            ROM = file.ReadBytes((int)file.BaseStream.Length);
           // pictureBox1.Image = LoadWholeChrPage(0, ROM, palDat);


            MetaTile test= new MetaTile();
            test.topLeft = 0x53;
            test.topRight = 0x54;
            test.bottomLeft = 0x55;
            test.bottomRight = 0x56;

            metatiles.Add(test);

           for (int x = 0; x < 50; x += 16)
            {
                for (int y = 0; y < 50; y += 16)
                {
                    DrawMetatile(metatiles[0], x, y, Graphics.FromImage(map16));
               }
            }
            pictureBox2.Image = map16;
        }

        Bitmap LoadWholeChrPage(int chrOffset, byte[] _theROM, Color[] _thePalette)
        {

    for(int i = 0; i < 256; i++) {
        int tileOffset = chrOffset + i * 16;
        Load_8x8(i, _theROM, tileOffset, chr, _thePalette);
            }
    return chr;
         }


        Bitmap Load_8x8(int tileNum, byte[] rom, int tileOffset, Bitmap canvas, Color[] palDat)
        {
            byte plane0;
            byte plane1;
            byte final;

            for (int y = 0; y < 8; y++)
            {
                for (int x = 0; x < 8; x++)
            {
                    plane0 = Convert.ToByte(((rom[tileOffset + y]) & (0x80 >> x)) >> (7 - x));
                    plane1 = Convert.ToByte(((rom[tileOffset + y + 8]) & (0x80 >> x)) >> (7 - x));
                    final = Convert.ToByte((plane1 << 1) + plane0);
                    canvas.SetPixel(x, y + tileNum * 8, palDat[final]);
                }
            }
            return canvas;
        }

        private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
        {
                    // Note: eight tiles per row in the tileset.
                    CurrentTile = ((e.Y / 8) * 1) + (e.X / 8);
                    label1.Text = "CurrentTile: " + CurrentTile.ToString();
        }



        void DrawTile(Graphics target, byte tileIndex, int x, int y)
        {
            // Determine where we will grab the tile from, assuming tiles are stored in a vertical strip
            var sourceRect = new Rectangle(0, tileIndex * 8, 8, 8);

            // Determine where it will be drawn
            var destRect = new Rectangle(x, y, 8, 8);

            // Draw it
            target.DrawImage(LoadWholeChrPage(0, ROM, palDat), destRect, sourceRect, GraphicsUnit.Pixel);
        }

        void DrawMetatile(MetaTile mt, int x, int y, Graphics target)
        {
            DrawTile(target,mt.topLeft, x, y);
            DrawTile(target,mt.topRight, x+8, y);
            DrawTile(target,mt.bottomLeft, x, y+8);
            DrawTile(target,mt.bottomRight, x+8, y+8);
        }


        }


    }