GirdView数据导出有关问题

GirdView数据导出问题
GirdView绑定SqlDataScourse数据源

想导出数据到Excel中，不是用流直接下载的，就是在服务器要保留所导出的excel

[解决办法]
本地导出，然后将execel文件上传到服务器
[解决办法]
保存也好处理啊

System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
this.GridView1.DataSourceId = "SqlDataScourse1";
this.GridView1.DataBind()
this.GridView1.RenderControl(oHtmlTextWriter);
File.WriteAllText(Server.Mappath("~/xxx.xls"),oStringWriter.ToString());