PDFsharp & MigraDoc Foundation

PdfSharp.Pdf.PdfDocument xDoc = new PdfSharp.Pdf.PdfDocument();
            xDoc.Pages.Add(new PdfSharp.Pdf.PdfPage() { Width = 500, Height = 750 });

            xDoc.Info.Author = "Autor";
            xDoc.Info.CreationDate = DateTime.Now;
            xDoc.Info.Creator = "Creator";
            xDoc.Info.Keywords = "KW1, KW2, KW3";
            xDoc.Info.Subject = "Subject";
            xDoc.Info.Title = "Title";

            PdfSharp.Pdf.PdfPage xPage = xDoc.Pages[0];

            PdfSharp.Pdf.Advanced.PdfResources rsx = xPage.GetResources();

            PdfSharp.Drawing.XGraphics gfx = PdfSharp.Drawing.XGraphics.FromPdfPage(xPage);
            PdfSharp.Drawing.XPen pen = new PdfSharp.Drawing.XPen(PdfSharp.Drawing.XColor.FromKnownColor(KnownColor.Red));
           
            ////Lines
            pen.LineCap = PdfSharp.Drawing.XLineCap.Round;

            int hLinesCount = 6104000;
            int vLinesCount = 4096000;
           
            int ii = 0;
            for (int i = 0; i < hLinesCount; i++)
            {
                ii = (ii < 750) ? ii + 2 : 0;
                System.Drawing.PointF p0 = new PointF(0, ii);
                System.Drawing.PointF p1 = new PointF(500, ii);
                gfx.DrawLine(pen, p0, p1);
            }

            ii = 0;
            for (int i = 0; i < vLinesCount; i++)
            {
                ii = (ii < 500) ? ii + 2 : 0;
                System.Drawing.PointF p0 = new PointF(ii, 0);
                System.Drawing.PointF p1 = new PointF(ii, 750);
                gfx.DrawLine(pen, p0, p1);
            }
           
            ////Lines--//

            xDoc.PageLayout = PdfSharp.Pdf.PdfPageLayout.SinglePage;
            xDoc.Save(fileFN); ///Here is exception!!!!!!!!!
            xDoc.Close();