Export GridView to PDF

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ASP.NET

I have a GridView, within that onevery row of the GridView there is a Drop Down List selected. and in other cells there are data with background color. How to export that grid view to pdf or exel...

when ever I am doing its generating the pdf along with all the option of Drop Down List..

Its the code I am using on export to pdf button click

Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=Vithal_Wadje.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        GridView1.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();
        htmlparser.Parse(sr);
        pdfDoc.Close();
        Response.Write(pdfDoc);
        Response.End();
        GridView1.AllowPaging = true;
        GridView1.DataBind();