Export Multiple Charts to PDF File on Button Click using iTextSharp in ASP.Net

Thanks for ur help sir..I got it..

Document pdfDoc = new Document(PageSize.A2, 10f, 10f, 10f, 0f);
PdfWriter.GetInstance(pdfDoc, stream);
pdfDoc.Open();
// pdfDoc.Add(pdfTable);
var chartimage = new MemoryStream();
var chartimage1 = new MemoryStream();
var chartimage2 = new MemoryStream();
var chartimage3 = new MemoryStream();
chart1.SaveImage(chartimage, ChartImageFormat.Png);
chart2.SaveImage(chartimage1, ChartImageFormat.Png);
chart3.SaveImage(chartimage2, ChartImageFormat.Png);
chart4.SaveImage(chartimage3, ChartImageFormat.Png);
iTextSharp.text.Image chart_image = iTextSharp.text.Image.GetInstance(chartimage.GetBuffer());
iTextSharp.text.Image chart_image1 = iTextSharp.text.Image.GetInstance(chartimage1.GetBuffer());
iTextSharp.text.Image chart_image2 = iTextSharp.text.Image.GetInstance(chartimage2.GetBuffer());
iTextSharp.text.Image chart_image3 = iTextSharp.text.Image.GetInstance(chartimage3.GetBuffer());
pdfDoc.Add(chart_image);
pdfDoc.Add(chart_image1);
pdfDoc.Add(chart_image2);
pdfDoc.Add(chart_image3);
pdfDoc.Close();
stream.Close();