"A generic error occurred in GDI+"

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C#

.NET

graphics

Bitmap

I get "A generic error occurred in GDI+" when I try to save a bitmap(that I have opened and edited). It only happens some of the time. I have no idea why this is happening, please help. It occurs at line 162.

Thanks in advance,
Jordan

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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public const double dratio = 16;
        public const int ratio = 16;

        public FileInfo FI = null;

        int mouseX = 0;
        int mouseY = 0;

        bool lMouse = false;
        bool rMouse = false;

        Color[,,,] map = new Color[16, 16, 8, 8];
        Color[,] buf = new Color[8, 8];

        public Form1()
        {
            InitializeComponent();
        }

        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            Panel panel = (Panel)sender;
            using (Graphics view = panel.CreateGraphics())
            {
                using (Bitmap b = new Bitmap(panel.Width, panel.Height))
                {
                    using (Graphics g = Graphics.FromImage(b))
                    {
                        g.Clear(Color.White);
                        mouseX = (int)Math.Floor(e.X / dratio);
                        mouseY = (int)Math.Floor(e.Y / dratio);
                        if (lMouse && mouseInBounds()) map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, mouseX, mouseY] = Color.Black;
                        else if (rMouse && mouseInBounds()) map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, mouseX, mouseY] = Color.White;
                        for (int x = 0; x < 8; x++)
                            for (int y = 0; y < 8; y++)
                            {
                                Pen pen = Pens.Black;
                                if (map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, x, y] == Color.Black) pen = Pens.White;
                                g.FillRectangle(new SolidBrush(map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, x, y]), x * ratio, y * ratio, ratio, ratio);
                                if (gridToolStripMenuItem.Checked)
                                g.DrawRectangle(pen, x*ratio, y*ratio, ratio, ratio);
                            }
                        g.DrawRectangle(Pens.Red, mouseX*ratio, mouseY*ratio, ratio, ratio);
                        view.DrawImage(b, 0, 0);
                    }
                }
            }
        }

        private bool mouseInBounds()
        {
            if (mouseX >= 0 && mouseX < 8 && mouseY >= 0 && mouseY < 8) return true;
            else return false;
        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = ((Panel)sender).CreateGraphics();
            g.Clear(Color.White);
            if (lMouse && mouseInBounds()) map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, mouseX, mouseY] = Color.Black;
            else if (rMouse && mouseInBounds()) map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, mouseX, mouseY] = Color.White;
            for (int x = 0; x < 8; x++)
                for (int y = 0; y < 8; y++)
                {
                    Pen pen = Pens.Black;
                    if (map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, x, y] == Color.Black) pen = Pens.White;
                    g.FillRectangle(new SolidBrush(map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, x, y]), x * ratio, y * ratio, ratio, ratio);
                    if (gridToolStripMenuItem.Checked)
                        g.DrawRectangle(pen, x * ratio, y * ratio, ratio, ratio);
                }
            g.Dispose();
        }

        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            switch (e.Button)
            {
                case MouseButtons.Left:
                    map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, mouseX, mouseY] = Color.Black;
                    lMouse = true;
                    break;
                case MouseButtons.Right:
                    map[(int)numericUpDown1.Value, (int)numericUpDown2.Value, mouseX, mouseY] = Color.White;
                    rMouse = true;
                    break;
            }
        }

        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            switch (e.Button)
            {
                case MouseButtons.Left:
                    lMouse = false;
                    break;
                case MouseButtons.Right:
                    rMouse = false;
                    break;
            }
        }

        private void gridToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ToolStripMenuItem item = (ToolStripMenuItem)sender;
            if (item.Checked) { item.Checked = false; panel1_Paint(panel1, null); return; }
            item.Checked = true;
            panel1_Paint(panel1, null);
        }

        private void numericUpDown_ValueChanged(object sender, EventArgs e)
        {
            panel1_Paint(panel1, null);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (numericUpDown1.Value != 15) numericUpDown1.Value++;
            else if (numericUpDown2.Value != 15) { numericUpDown1.Value = 0; numericUpDown2.Value++; }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (numericUpDown1.Value != 0) numericUpDown1.Value--;
            else if (numericUpDown2.Value != 0) { numericUpDown1.Value = 15; numericUpDown2.Value--; }
        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (FI == null) saveAsToolStripMenuItem_Click(null, null);
            else
            {
                Bitmap file = new Bitmap(128, 128);
                for(int x1 = 0; x1 < 16; x1++)
                    for(int y1 = 0; y1 < 16; y1++)
                        for(int x2 = 0; x2 < 8; x2++)
                            for(int y2 = 0; y2 < 8; y2++)
                                if (map[x1, y1, x2, y2] == Color.Black)
                                {
                                    file.SetPixel((x1 * 8) + x2, (y1 * 8) + y2, Color.White);
                                    toolStripProgressBar1.Value++;
                                }
                                else
                                {
                                    file.SetPixel((x1 * 8) + x2, (y1 * 8) + y2, Color.Transparent);
                                    toolStripProgressBar1.Value++;
                                }
                file.Save(FI.FullName, ImageFormat.Png);
                MessageBox.Show("Saved To:" + FI.FullName, "Done!", MessageBoxButtons.OK, MessageBoxIcon.Information);
                toolStripProgressBar1.Value = 0;
                file.Dispose();
            }
        }

        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog SFD = new SaveFileDialog();
            SFD.Filter = "Minecraft PNG Font Files(*.png)|*.png";
            if (SFD.ShowDialog() == DialogResult.OK)
            {
                FI = new FileInfo(SFD.FileName);
                saveToolStripMenuItem_Click(null, null);
            }
        }

        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog OFD = new OpenFileDialog();
            OFD.Filter = "Minecraft PNG Font Files(*.png)|*.png";
            if (OFD.ShowDialog() == DialogResult.OK)
            {
                Bitmap b = new Bitmap(Image.FromFile(OFD.FileName));
                if ((b.Width % 128 == 1 || b.Width % 128 == 1) && b.Width != b.Height)
                {
                    if (MessageBox.Show("File does not appear to be a font file, it may not load correctly. Would you like to continue loading this file?", "Unkown File Format", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
                    {
                        FI = new FileInfo(OFD.FileName);
                        b = new Bitmap(b, 128, 128);
                        loadFont(b);
                    }
                }
                else
                {
                    FI = new FileInfo(OFD.FileName);
                    if (b.Width != 128 || b.Height != 128)
                        b = new Bitmap(b, 128, 128);
                    loadFont(b);
                }
                b.Dispose();
            }
        }

        private void loadFont(Bitmap b)
        {
            for (int x1 = 0; x1 < 16; x1++)
                for (int y1 = 0; y1 < 16; y1++)
                    for (int x2 = 0; x2 < 8; x2++)
                        for (int y2 = 0; y2 < 8; y2++)
                        {
                            //MessageBox.Show(b.GetPixel((x1*8)+x2, (y1*8)+y2)+" "+Color.White);
                            if (b.GetPixel((x1 * 8) + x2, (y1 * 8) + y2).Equals(Color.FromArgb(255, 255, 255, 255)))
                            {
                                map[x1, y1, x2, y2] = Color.Black;
                                toolStripProgressBar1.Value++;
                            }
                            else
                            {
                                map[x1, y1, x2, y2] = Color.White;
                                toolStripProgressBar1.Value++;
                            }
                            toolStripProgressBar1.Value = 0;
                            numericUpDown1.Value = 0;
                            numericUpDown2.Value = 0;
                        }
        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Array.Clear(map, 0, map.Length);
            panel1_Paint(panel1, null);
        }
    }
}