public ActionResult Measurements()
        {
            ViewBag.CurrentPage = "Children";
            string chart = _childService.GetMeasurementChartForSession(User.Identity.Name);

            VaccinationReport report = new VaccinationReport();
            var usr = User;

            PdfDocument document = report.CreateDocumentWithChart(chart);
            //string ddl = MigraDoc.DocumentObjectModel.IO.DdlWriter.WriteToString(document);
            PdfDocumentRenderer renderer = new PdfDocumentRenderer(true, PdfSharp.Pdf.PdfFontEmbedding.Always);
            renderer.PdfDocument = document;

            //already pdf
            //renderer.RenderDocument();

            using (MemoryStream stream = new MemoryStream())
            {
                renderer.PdfDocument.Save(stream, false);
                return File(stream.ToArray(), "application/pdf");
            }

        }