PDFsharp & MigraDoc Foundation

        protected void Page_Load(object sender, EventArgs e)
        {
            // Send PDF to browser
            MemoryStream stream = new MemoryStream();
            MyPDF.Documents.CreateAndSave(stream, false);
            Response.Clear();
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-length", stream.Length.ToString());
            Response.AppendHeader("content-disposition", "attachment; filename=\"MyPDF.pdf\"");
            Response.BinaryWrite(stream.ToArray());
            Response.Flush();
            stream.Close();
            Response.End();
        }

        public static void CreateAndSave(Stream stream, bool closeStream)
        {
            Document document = Documents.CreateDocument();

            PdfDocumentRenderer renderer = new PdfDocumentRenderer(true, PdfSharp.Pdf.PdfFontEmbedding.Always);
            renderer.Document = document;

            renderer.RenderDocument();

            renderer.PdfDocument.Save(stream, closeStream);
        }