preview button

 printDocument1.DefaultPageSettings.PaperSize = new System.Drawing.Printing.PaperSize(printDocument1.DocumentName, 825, 1100);//Paper Size
                this.printPreviewDialog1.Document = this.printDocument1;
                printPreviewDialog1.ShowDialog();
                PrintDialog printDialog = new PrintDialog();
                printDialog.Document = printDocument1;
                printDialog.UseEXDialog = true;