private void GenerateHeader(GenerateInvoiceContext request, PdfGenerator pdf)
        {
            RectangleF bounds = new RectangleF(0, 0, pdf.PageWidth, 50);

            PdfPageTemplateElement header = new PdfPageTemplateElement(bounds);

            pdf.DrawText("Header Text", 10, 0, pdf.NormalFont, pdf.AccentBrush, header.Graphics);

            pdf.Document.Template.Top = header;
        }