Exporting Data from Form to Excel,Word and PDF in Asp.Net

--Export to Excel:--

using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html;
using iTextSharp.text.html.simpleparser;
protected void btnexporttoexcel_click(object sender, EventArgs e)
    {
        string attachment = "attachment; filename=ContractorDetails.xls";
        Response.ClearContent();
        Response.AddHeader("content-disposition", attachment);
        Response.ContentType = "application/ms-excel";
        StringWriter sw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(sw);
        HtmlForm frm = new HtmlForm();
        gvclientcontractordetails.Parent.Controls.Add(frm);
        frm.Attributes["runat"] = "server";
        frm.Controls.Add(gvclientcontractordetails);
        frm.RenderControl(htw);
        Response.Write(sw.ToString());
        Response.End();
    }
 public override void VerifyRenderingInServerForm(Control control)
    {
        /* Verifies that the control is rendered */
    }
--Export to Word:---

     Response.AddHeader("content-disposition", "attachment;filename=Export.doc");

            Response.Cache.SetCacheability(HttpCacheability.NoCache);

            Response.ContentType = "application/vnd.word";

 

            StringWriter stringWrite = new StringWriter();

            HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

 

            HtmlForm frm = new HtmlForm();

            gv.Parent.Controls.Add(frm);

            frm.Attributes["runat"] = "server";

            frm.Controls.Add(gv);

            frm.RenderControl(htmlWrite);

      

            Response.Write(stringWrite.ToString());

            Response.End();

--Export to PDF--

            Response.ContentType = "application/pdf";

            Response.AddHeader("content-disposition", "attachment;filename=Export.pdf");

            Response.Cache.SetCacheability(HttpCacheability.NoCache);

            StringWriter sw = new StringWriter();

            HtmlTextWriter hw = new HtmlTextWriter(sw);

            HtmlForm frm = new HtmlForm();

            gv.Parent.Controls.Add(frm);

            frm.Attributes["runat"] = "server";

            frm.Controls.Add(gv);

            frm.RenderControl(hw);

            StringReader sr = new StringReader(sw.ToString());

            Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);

            HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

            PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

            pdfDoc.Open();