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Question

Hi guys,

This is something I am desperately trying to figure out. I am attaching the portion of the code I am having problem with, along with the point where the exception was raised. Any help would be appreciated.

private void button1_Click(object sender, EventArgs e)

        {

            try

            {

              PrintPreviewDialog printPreviewDialog1 = new PrintPreviewDialog(); // instantiate new print preview dialog

 

                printPreviewDialog1.Document = this.printDocument1;

                printPreviewDialog1.FormBorderStyle = FormBorderStyle.Fixed3D;

                printPreviewDialog1.SetBounds(20, 20, this.Width, this.Height);

                printPreviewDialog1.ShowDialog(); // Show the print preview dialog, uses print page event to draw preview screen

            }

            catch (Exception exp)

            {

                //System.Console.WriteLine(exp.Message.ToString());

                MessageBox.Show("Exception caught",exp.ToString());

            }

        }

         RectangleF GetScaledRectangle(float x, float y, RectangleF r)

        {

            RectangleF result = new RectangleF(r.X * x, r.Y * y, r.Width * x, r.Height * y);

            return result;

        }

        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)

        {

           this.Focus();

            Graphics g = e.Graphics;

           

                // RectangleF srcRect = new Rectangle(0, 0, this.LargerImage.Width, 

                // LargerImage.Height);

                int a = this.BackgroundImage.Width;

                int b = this.BackgroundImage.Height;

                Rectangle srcRect = new Rectangle(0, 0, a, b);

                RectangleF cr = srcRect;

                int nWidth = printDocument1.PrinterSettings.DefaultPageSettings.PaperSize.Width;

                int nHeight = printDocument1.PrinterSettings.DefaultPageSettings.PaperSize.Height;

                RectangleF destRect = new RectangleF(0, 0, nWidth, nHeight);

                g.DrawImage(this.BackgroundImage, destRect, srcRect, GraphicsUnit.Pixel);

                // g.DrawImage(this.LargerImage, destRect, srcRect, GraphicsUnit.Pixel);

                float scalex = destRect.Width / this.BackgroundImage.Width;

                float scaley = destRect.Height / this.BackgroundImage.Height;

                Pen aPen = new Pen(Brushes.Black, 1);

                for (int i = 0; i < this.Controls.Count; i++)

                {

                    // draw logo

                    if (Controls[i].GetType() == this.pictureBox1.GetType())

                    {

                        if (pictureBox1.Image != null)

                        {

                            GraphicsUnit gu = GraphicsUnit.Pixel;

                            RectangleF scaledRectangle = GetScaledRectangle(scalex, scaley, pictureBox1.Bounds);

                            Image myImage = (Image)pictureBox1.Image.Clone();

                            g.DrawImage(myImage, scaledRectangle, pictureBox1.Image.GetBounds(ref gu), GraphicsUnit.Pixel);

                        }

                    }

Exception is raised at the point underlined in red. The exception raised is NullReferenceException unhandled. I am at a loss. Please help.