protected void btnCreatePDF_Click(object sender, EventArgs e)
{
    // create a PDF document
    Document document = new Document();

    // set the license key
    document.LicenseKey = "B4mYiJubiJiInIaYiJuZhpmahpGRkZE=";

    // add a page to the PDF document
    PdfPage firstPage = document.AddPage();

    // draw rectangle
    RectangleElement rectangle1 = new RectangleElement(10, 10, 150, 100);
    rectangle1.ForeColor = System.Drawing.Color.Blue;
    rectangle1.LineStyle.LineWidth = 5; // a 5 points line width
    rectangle1.LineStyle.LineJoinStyle = LineJoinStyle.RoundJoin;
    firstPage.AddElement(rectangle1);

    // draw colored rectangle
    RectangleElement rectangle2 = new RectangleElement(200, 10, 150, 100);
    rectangle2.ForeColor = System.Drawing.Color.Blue;
    rectangle2.BackColor = System.Drawing.Color.Green;
    firstPage.AddElement(rectangle2);

    // draw gradient colored rectangle
    RectangleElement rectangle3 = new RectangleElement(400, 25, 100, 50);
    rectangle3.ForeColor = System.Drawing.Color.Blue;
    rectangle3.Gradient = new GradientColor(GradientDirection.Vertical, System.Drawing.Color.Green, System.Drawing.Color.Blue);
    firstPage.AddElement(rectangle3);

    // draw ellipse
    EllipseElement ellipse1 = new EllipseElement(75, 200, 70, 50);
    ellipse1.ForeColor = System.Drawing.Color.Blue;
    ellipse1.LineStyle.LineDashStyle = LineDashStyle.Dash;
    firstPage.AddElement(ellipse1);

    // draw ellipse
    EllipseElement ellipse2 = new EllipseElement(275, 200, 70, 50);
    ellipse2.ForeColor = System.Drawing.Color.Blue;
    ellipse2.BackColor = System.Drawing.Color.Green;
    firstPage.AddElement(ellipse2);

    // draw ellipse
    EllipseElement ellipse3 = new EllipseElement(450, 200, 50, 25);
    ellipse3.ForeColor = System.Drawing.Color.Blue;
    ellipse3.Gradient = new GradientColor(GradientDirection.Vertical, System.Drawing.Color.Green, System.Drawing.Color.Blue);
    firstPage.AddElement(ellipse3);


    BezierCurveElement bezierCurve1 = new BezierCurveElement(10, 350, 100, 300, 200, 400, 300, 350);
    bezierCurve1.ForeColor = System.Drawing.Color.Blue;
    bezierCurve1.LineStyle.LineWidth = 3;
    bezierCurve1.LineStyle.LineJoinStyle = LineJoinStyle.RoundJoin;
    firstPage.AddElement(bezierCurve1);

    BezierCurveElement bezierCurve2 = new BezierCurveElement(10, 350, 100, 400, 200, 300, 300, 350);
    bezierCurve2.ForeColor = System.Drawing.Color.Green;
    bezierCurve2.LineStyle.LineWidth = 3;
    bezierCurve2.LineStyle.LineJoinStyle = LineJoinStyle.RoundJoin;
    firstPage.AddElement(bezierCurve2);

    try
    {
        // get the PDF document bytes
        byte[] pdfBytes = document.Save();

        // send the generated PDF document to client browser

        // get the object representing the HTTP response to browser
        HttpResponse httpResponse = HttpContext.Current.Response;

        // add the Content-Type and Content-Disposition HTTP headers
        httpResponse.AddHeader("Content-Type", "application/pdf");
        httpResponse.AddHeader("Content-Disposition", String.Format("attachment; filename=Shapes.pdf; size={0}", pdfBytes.Length.ToString()));

        // write the PDF document bytes as attachment to HTTP response 
        httpResponse.BinaryWrite(pdfBytes);

        // Note: it is important to end the response, otherwise the ASP.NET
        // web page will render its content to PDF document stream
        httpResponse.End();
    }
    finally
    {
        // close the PDF document to release the resources
        document.Close();
    }
}