What is the best way to export to Excel

public static void Export(string fileName, GridView gv)
       {
           HttpContext.Current.Response.Clear();
           HttpContext.Current.Response.AddHeader(
               "content-disposition", string.Format("attachment; filename={0}", fileName));
           HttpContext.Current.Response.ContentType = "application/ms-excel";

           using (StringWriter sw = new StringWriter())
           {
               using (HtmlTextWriter htw = new HtmlTextWriter(sw))
               {
                   //  Create a form to contain the grid
                   Table table = new Table();

                   table.GridLines = gv.GridLines;

                   //  add the header row to the table
                   if (gv.HeaderRow != null)
                   {
                       GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                       table.Rows.Add(gv.HeaderRow);
                   }

                   //  add each of the data rows to the table
                   foreach (GridViewRow row in gv.Rows)
                   {
                       GridViewExportUtil.PrepareControlForExport(row);
                       table.Rows.Add(row);
                   }

                   //  add the footer row to the table
                   if (gv.FooterRow != null)
                   {
                       GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
                       table.Rows.Add(gv.FooterRow);
                   }

                   //  render the table into the htmlwriter
                   table.RenderControl(htw);

                   //  render the htmlwriter into the response
                   HttpContext.Current.Response.Write(sw.ToString());
                   HttpContext.Current.Response.End();
               }
           }
       }

       /// <summary>
       /// Replace any of the contained controls with literals
       /// </summary>
       /// <param name="control"></param>
       private static void PrepareControlForExport(Control control)
       {
           for (int i = 0; i < control.Controls.Count; i++)
           {
               Control current = control.Controls[i];
               if (current is LinkButton)
               {
                   control.Controls.Remove(current);
                   control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));
               }
               else if (current is ImageButton)
               {
                   control.Controls.Remove(current);
                   control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));
               }
               else if (current is HyperLink)
               {
                   control.Controls.Remove(current);
                   control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));
               }
               else if (current is DropDownList)
               {
                   control.Controls.Remove(current);
                   control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));
               }
               else if (current is CheckBox)
               {
                   control.Controls.Remove(current);
                   control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));
               }

               if (current.HasControls())
               {
                   GridViewExportUtil.PrepareControlForExport(current);
               }
           }
       }
   }