我导入数据后，picturebox内自动生成了曲线图，我另加了一个打印按钮，希望按下打印按钮后，能够打印picturebox内的曲线图，我是一个初学者，希望高手帮帮忙，先谢谢了！

我不明白打印事件是怎么发生的
如果我是：
 private void button2_Click(object sender, EventArgs e)
{
            PrintDialog MyPrintDg = new PrintDialog();
            MyPrintDg.Document = printDocument2;
            printDocument2.PrintPage += new PrintPageEventHandler(this.printDocument2_PrintPage);
            if (MyPrintDg.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    printDocument2.Print();
                }
                catch
                {   //停止打印
                    printDocument2.PrintController.OnEndPrint(printDocument2, new System.Drawing.Printing.PrintEventArgs());
                }
            }
        }
 private void printDocument2_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            e.Graphics.DrawImage(pictureBoxBoXing.Image, 0, 0);
            e.HasMorePages = true;//允许多页打印
         }
这是哪儿错了，根本打印不出东西来，特别是到e.Graphics.DrawImage(pictureBoxBoXing.Image, 0, 0);
这一句就不执行了！希望你指点一下，谢谢了！