Export Grid to Pdf Using Mvc4

public ActionResult ExportPdf()

{

GridView gv = new GridView();

gv.DataSource = fetch();

gv.DataBind();

Response.ClearContent();

Response.Buffer = true;

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

Response.ContentType = "application/pdf";

Response.Charset = "";

StringWriter sw = new StringWriter();

HtmlTextWriter htw = new HtmlTextWriter(sw);

gv.RenderControl(htw);

Response.Output.Write(sw.ToString());

Response.Flush();

Response.End();

return RedirectToAction("Index");

}