asp.net+dbgrid导出excel后，excel文件不能读取问题
在网络由很多dbgrid导出excel的文章，我使用如下方式导出excel文件
打开此文件，始终提示不能读取excel文件，请大侠指点，我用的excel2003
private void Button1_Click(object sender, System.EventArgs e)
{
Response.Clear();  
Response.Buffer= true;  
Response.Charset="utf-8";  
Response.AppendHeader("Content-Disposition","attachment;filename=test.xls");  
Response.ContentEncoding=System.Text.Encoding.GetEncoding("utf-8");  
Response.ContentType = "application/ms-excel";  
this.EnableViewState =false;
System.IO.StringWriter oStringWriter = new System.IO.StringWriter();  
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);  
this.DataGrid1.RenderControl(oHtmlTextWriter);  
Response.Write(oStringWriter.ToString());  
Response.End();  

  //ToExcel(DataGrid1);
}

------解决方案--------------------
是不是你有别的程序打开了这个excel？