将gridview导出为具有数字列的Excel

Question

我想将gridview导出为ex​​cel。一列包含数值，如：

  

12345678998765432112345678899

但是当我导出到excel时，它显示为：

  

1234 + E11

我不想这样，我想要全部价值。

我使用了以下代码

 Response.Clear();
 Response.Buffer = true;
 Response.AddHeader("content-disposition", "attachment;filename=ReportOutput.xls");
 Response.Charset = "";
 Response.ContentType = "application/vnd.ms-excel";

 System.IO.StringWriter tw = new System.IO.StringWriter();
 System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);

 hw.WriteLine("<h3>Output Form</h3>");

 GridView1.RenderControl(hw);
 string style = "<style> .textmode { mso-number-format:\\@; } </style>";

 Response.Write(style);
 Response.Output.Write(tw.ToString());
 Response.Flush();
 Response.End();

仍然没有用。