Export MS Chart with some Label Text to PDF in ASP.Net

You need to process the Chart control separately for exporting it to PDF.

Please refer this link

http://www.aspforums.net/Threads/172579/Export-ASPNet-Panel-with-GridView-DropDownList-to-PDF-using-iTextSharp/Replies/3#Replies

I have created the sample which first adds the Panel content and then ASP.Net chart control.

Note: Your chart control should be outside of Panel control.

Ref:

Export ASP.Net Chart Control to PDF Document using iTextSharp Library

HTML

<form id="form1" runat="server">
<asp:Panel ID="Panel1" runat="server">
    <asp:Label Text="This is the sample for exporting the ASP.Net chart control with Data"
        runat="server" />
</asp:Panel>
<asp:Chart ID="Chart1" runat="server" Height="300px" Width="400px">
    <Titles>
        <asp:Title ShadowOffset="3" Name="Items" />
    </Titles>
    <Legends>
        <asp:Legend Alignment="Center" Docking="Bottom" IsTextAutoFit="False" Name="Default"
            LegendStyle="Row" />
    </Legends>
    <Series>
        <asp:Series Name="Default" />
    </Series>
    <ChartAreas>
        <asp:ChartArea Name="ChartArea1" BorderWidth="0" />
    </ChartAreas>
</asp:Chart>
<br />
<asp:Button ID="btnExportPDF" runat="server" Text="Export to PDF" OnClick="btnExportPDF_Click" />
</form>

Namespaces

using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.Web.UI.DataVisualization.Charting;
using iTextSharp.text.html.simpleparser;

C#

protected void Page_Load(object sender, EventArgs e)
{
    string[] x = new string[4] { "Mango", "Apple", "Orange", "Banana" };
    int[] y = new int[4] { 200, 112, 55, 96 };
    Chart1.Series[0].Points.DataBindXY(x, y);
    Chart1.Series[0].ChartType = SeriesChartType.Pie;
    Chart1.ChartAreas["ChartArea1"].Area3DStyle.Enable3D = true;
    Chart1.Legends[0].Enabled = true;
}

protected void btnExportPDF_Click(object sender, EventArgs e)
{
    Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
    PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

    using (MemoryStream stream = new MemoryStream())
    {
        Chart1.SaveImage(stream, ChartImageFormat.Png);

        iTextSharp.text.Image chartImage = iTextSharp.text.Image.GetInstance(stream.GetBuffer());
        chartImage.ScalePercent(75f);
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        Panel1.RenderControl(hw);
        StringReader sr = new StringReader(sw.ToString());
        HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
        pdfDoc.Open();
        htmlparser.Parse(sr);
        pdfDoc.Add(chartImage);
        pdfDoc.Close();

        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=Chart.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.Write(pdfDoc);
        Response.End();
    }
}

Screenshot