private void export_to_word()
    {

        try
        {
            data_grid_print.Visible = true;
            //grd_detail.Visible = true;
            Response.Clear();
            Response.AddHeader("content-disposition", "attachment;filename=FileName.doc");
            Response.Charset = "";
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.ContentType = "application/vnd.word";

            System.IO.StringWriter stringWrite = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

            data_grid_print.RenderControl(htmlWrite);
            Response.Write(stringWrite.ToString());

            Response.End();
            htmlWrite.Flush();
            //grd_detail.Visible = false;
            data_grid_print.Visible = false;
        }
        catch (Exception ex)
        {
        }
    }

 private void export_to_pdf()
    {
        try
        {

            data_grid_print.Visible = true;
            HtmlForm form = new HtmlForm();
            form.Controls.Add(data_grid_print);
            StringWriter sw = new StringWriter();
            HtmlTextWriter hTextWriter = new HtmlTextWriter(sw);
            form.Controls[0].RenderControl(hTextWriter);
            string html = sw.ToString();
            Document Doc = new Document();
            PdfWriter.GetInstance
            (Doc, new FileStream(Environment.GetFolderPath
            (Environment.SpecialFolder.Desktop)
            + "\\Pin_report_unsoldpin.pdf", FileMode.Create));
            Doc.Open();
            Chunk c = new Chunk
            ("PDF Report For Unsoldpin  \n",
            FontFactory.GetFont("Verdana", 10));
            Paragraph p = new Paragraph();
            p.Alignment = Element.ALIGN_CENTER;
            p.Add(c);
            Chunk chunk1 = new Chunk
            (" \n", FontFactory.GetFont("Verdana", 6));
            Paragraph p1 = new Paragraph();
            p1.Alignment = Element.ALIGN_RIGHT;
            p1.Add(chunk1);

            Doc.Add(p);
            Doc.Add(p1);
            System.Xml.XmlTextReader xmlReader =
            new System.Xml.XmlTextReader(new StringReader(html));
            HtmlParser.Parse(Doc, xmlReader);

            Doc.Close();
            string Path = Environment.GetFolderPath
            (Environment.SpecialFolder.Desktop)
            + "\\Pin_report_unsoldpin.pdf";


            //ShowPdf(Path);
            data_grid_print.Visible = false;

        }
        catch (Exception ex)
        {
        }
        finally
        {
        }

    }

private void export_to_excel()
    {
        try
        {
            //grd_detail.Visible = true;
            data_grid_print.Visible = true;
            Response.Clear();

            Response.AddHeader("content-disposition", "attachment;filename=Customerlist.xls");
            Response.Charset = "";
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.ContentType = "application/vnd.xls";
            System.IO.StringWriter stringWrite = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
            data_grid_print.RenderControl(htmlWrite);
            Response.Write(stringWrite.ToString());
            Response.End();
            data_grid_print.Visible = false;
            //grd_detail.Visible = false;
        }
        catch (Exception ex)
        {
        }
        finally
        {
        }

    }

                              
     SmtpClient smtpclient;
        MailMessage message;
            string str234 = "Name=" + txtname.Text + "\n Address=" + txtaddress.Text 

            + "" + "'\n Phone No=" + txtmobileno.Text + "\n Fax No=" + txtfax.Text

            + "\n Email=" + txtemail.Text + "\n Message=" + txtmessage.Text;

            smtpclient = new SmtpClient();
            message = new MailMessage();

            message.From = new MailAddress("developerlifestyle@gmail.com");
            message.To.Add("developerlifestyle@gmail.com");  //send email to gmail

            message.Subject = "Contact Form";
            message.Body = str234;
            smtpclient.Host = "smtp.gmail.com";
            smtpclient.EnableSsl = true;
            smtpclient.UseDefaultCredentials = true;
            System.Net.NetworkCredential network = new System.Net.NetworkCredential();
            network.UserName = "developerlifestyle@gmail.com"; 
            network.Password = "*******"; //password
            smtpclient.UseDefaultCredentials = true;
            smtpclient.Credentials = network;
            smtpclient.Port = 25;
            smtpclient.Send(message);

     }