/// <summary>
        /// 打印的按钮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPrint_Click(object sender, EventArgs e)
        {
           
            // printDocument1 为 打印控件
            //设置打印用的纸张 当设置为Custom的时候，可以自定义纸张的大小，还可以选择A4,A5等常用纸型
            this.printDocument1.DefaultPageSettings.PaperSize = new PaperSize("Custum", 500, 300);
            this.printDocument1.PrintPage += new PrintPageEventHandler(this.MyPrintDocument_PrintPage);
            //将写好的格式给打印预览控件以便预览
            printPreviewDialog1.Document = printDocument1;
            //显示打印预览
            DialogResult result = printPreviewDialog1.ShowDialog();
            //if (result == DialogResult.OK)
            //this.MyPrintDocument.Print();
        }

/// <summary>
        /// 打印的格式
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void MyPrintDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            /*如果需要改变自己 可以在new Font(new FontFamily("黑体"),11）中的“黑体”改成自己要的字体就行了，黑体 后面的数字代表字体的大小
             System.Drawing.Brushes.Blue , 170, 10 中的 System.Drawing.Brushes.Blue 为颜色，后面的为输出的位置 */
            e.Graphics.DrawString("新乡市三月软件公司入库单", new Font(new FontFamily("黑体"),11), System.Drawing.Brushes.Black, 170, 10);
            e.Graphics.DrawString("供货商:河南科技学院", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Blue, 10, 12);
            //信息的名称
            e.Graphics.DrawLine(Pens.Black, 8, 30, 480, 30);
            e.Graphics.DrawString("入库单编号" , new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 9, 35);
            e.Graphics.DrawString("商品名称", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 160, 35);
            e.Graphics.DrawString("数量", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 260, 35);
            e.Graphics.DrawString("单价", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 330, 35);
            e.Graphics.DrawString("总金额", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 400, 35);
            e.Graphics.DrawLine (Pens.Black ,8,50,480,50);
            //产品信息
            e.Graphics.DrawString("R2011-01-2016:06:35", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 9, 55);
            e.Graphics.DrawString("联想A460", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 160, 55);
            e.Graphics.DrawString("100", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 260, 55);
            e.Graphics.DrawString("200.00", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 330, 55);
            e.Graphics.DrawString("20000.00", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 400, 55);

e.Graphics.DrawLine(Pens.Black, 8, 200, 480, 200);
            e.Graphics.DrawString("地址：新乡市河南科技学院信息工程学院", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 9, 210);
            e.Graphics.DrawString("经办人:任忌", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 220, 210);
            e.Graphics.DrawString("服务热线:15083128577", new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 320, 210);
            e.Graphics.DrawString("入库时间:"+DateTime.Now .ToString (), new Font(new FontFamily("黑体"), 8), System.Drawing.Brushes.Black, 9, 230);
        }