datatable 导出数据到excel 数字格式不变

 void Page_Load(object sender, System.EventArgs e)
{
 string data1 = "000000001";
 long data2 = 123456789123456789;
 System.IO.StringWriter sw = new System.IO.StringWriter();
 sw.WriteLine("原数字1/t转换后数字1/t原数字2/t转换数字2");
 for(int i= 0;i<10;i++)
 {
        sw.WriteLine(data1 +"/t" + "=/"" + data1 + "/"/t" + data2 +"/t" + "=/"" + data2.ToString() + "/"");
 }
 sw.Close();
 Response.Buffer= true;
 Response.Charset="";
 Response.AppendHeader("Content-Disposition","attachment;filename=aa.xls");
 Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。
 Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
 Response.Write(sw);
 Response.End();
 
}
各位大虾理解吗？我对这部分比较了解，不了解的留言待我解答