How To Export Data From Table To Pdf

I want to export data from table to pdf. following code doesn't give any error. but when new pdf created then there is no data in the file.

private void ExportToPDF(string strFileName, HtmlTable dg)
{
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-pdf";
Response.AddHeader("content-disposition", "attachment;filename=" + strFileName);
Response.Charset = "";
this.EnableViewState = false;
System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htw = new HtmlTextWriter(sw);
dg.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();
}