C# 到处报表 代码出错了 高手帮忙看

代码如下:Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=FileName.doc");
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.word";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
GridView1.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString());
Response.End();

错误：类型“GridView”的控件“ctl00_ContentPlaceHolder1_TabContainer1_TPSel_GridView1”必须放在具有 runat=server 的窗体标记内

<form runat=server ></form>有没有？

你的gridview是否有runat=server 的标记呢