PdfDocument doc = PdfSharp.Pdf.IO.PdfReader.Open(path);

XFont fontReportHeader = new XFont("Verdana", 16, XFontStyle.Bold);
XFont fontFooterAddress = new XFont("Verdana", 8, XFontStyle.Regular);

XColor myColour = XColor.FromArgb(216, 30, 5);
XPen pen = new XPen(myColour, 1);

Ximage imgLogo = XImage.FromFile(Server.MapPath(@"~/Images/Logo.png"));

foreach (PdfPage page in doc.Pages)
{
            XUnit pageWidth = page.Width;
            XUnit pageHeight = page.Height;

            XUnit headerTop = 25;
            XUnit headerBottom = 50;

            XUnit footerTop = pageHeight - 50;
            XUnit footerBottom = pageHeight - 25;
           
            XLinearGradientBrush brush = new XLinearGradientBrush(new XRect(0, 0, pageWidth, pageHeight), myColour, myColour, XLinearGradientMode.Horizontal);


            XGraphics gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Append);

            // header
            gfx.DrawLine(pen, 15, headerBottom, pageWidth, headerBottom);
            gfx.DrawString(reportName, fontReportHeader, brush, 15, 45, XStringFormat.Default); // reportName is a string variable

            // footer
            gfx.DrawLine(pen, 15, footerTop, pageWidth, footerBottom);
            gfx.DrawImage(imgLogo, 15, footerTop + imgLogo.PointHeight + 2, imgLogo.PointWidth, imgLogo.PointHeight);
            gfx.DrawString(address, fontFooterAddress, brush, 15, footerTop + imgLogo.PointHeight + 2, XStringFormat.TopLeft); // address is string variable
}

doc.Save(path);