Pdf page size changes during printing to a check

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C#

ASP.NET

WebForms

Hi All,
I have creaed a pdf form to print to a check using web application.The form prints correctly on an A4 sise paper.But while printing the form to a cheque of 20*10cm (width*height) the full alignment changes.I have set the papersize but while printing the papersize changes.
Can anyone help me please.Any help will really appreciated.Thanks in advance

What I have tried:

PdfDocument pdf = new PdfDocument();
               PdfPage pdfPage = pdf.AddPage();

               pdfPage.TrimMargins.Top = 0;
               pdfPage.TrimMargins.Right = 0;
               pdfPage.TrimMargins.Bottom = 0;
               pdfPage.TrimMargins.Left = 0;
               pdfPage.Width = XUnit.FromInch(8);
               pdfPage.Height= XUnit.FromInch(4);
               pdfPage.Orientation = PageOrientation.Portrait;
               XGraphics graph = XGraphics.FromPdfPage(pdfPage);
               XFont font = new XFont("Verdana", 10, XFontStyle.Regular);

               graph.DrawString(date1, font, XBrushes.Black,
               new XRect(6.259843 * 72, 0.590551 * 72, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);

               graph.DrawString(provider, font, XBrushes.Black,
               new XRect(1.69291 * 72, 1.22047 * 72, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);

               graph.DrawString("***" + premium + "***", font, XBrushes.Black,
              new XRect(6.181102 * 72, 2.08661 * 72, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);

               if (countSpaces >= 9)
               {
                   var firstSpaceIndex = PremiumInWords.IndexOf(" ", PremiumInWords.IndexOf(" ", PremiumInWords.IndexOf(" ", PremiumInWords.IndexOf(" ", PremiumInWords.IndexOf(" ", PremiumInWords.IndexOf(" ", PremiumInWords.IndexOf(" ", PremiumInWords.IndexOf(" ") + 1) + 1) + 1) + 1) + 1) + 1) + 1);
                   var firstString = PremiumInWords.Substring(0, firstSpaceIndex);
                   var secondString = PremiumInWords.Substring(firstSpaceIndex + 1);
                   graph.DrawString("***" + firstString, font, XBrushes.Black,
              new XRect(0.984252 * 72, 1.73228 * 72, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);
                   graph.DrawString(secondString + "***", font, XBrushes.Black,
             new XRect(0.590551 * 72, 2.16535 * 72, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);


               }
               else
               {

                   graph.DrawString("***" + PremiumInWords + "***", font, XBrushes.Black,
                  new XRect(0.984252 * 72, 1.73228 * 72, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);

               }
               MemoryStream stream = new MemoryStream();
               pdf.Save(stream, false);
               Response.Clear();
               Response.ContentType = "application/pdf";
               Response.AddHeader("Content-Disposition", string.Format("inline;filename=Schedule-{0}.pdf", No));
               Response.BinaryWrite(stream.ToArray());
               Response.Flush();
               stream.Close();
                Response.End();

           }