能否用ie打开Excel文件

Question

用网上提供的以下代码把DataGrid控件送回给浏览器端,
但浏览器端是打开Excel来打开DataGrid的,并且还提示两次是 打开 还是 下载.
能否这样:
    1,不提示,直接用Excel打开;
    2,不另外打开Excel,而是将Excel并入ie中.(我看过jsp做过,能行的)  
// HttpContext.Current.Response.Charset ="GB2312";
HttpContext.Current.Response.Charset ="";
HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename=money.xls");

HttpContext.Current.Response.ContentEncoding =System.Text.Encoding.GetEncoding("GB2312"); 
HttpContext.Current.Response.ContentType ="application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword
ctl.Page.EnableViewState =false;
System.IO.StringWriter  tw = new System.IO.StringWriter() ;
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter (tw);
ctl.RenderControl(hw);
HttpContext.Current.Response.Write(tw.ToString());
HttpContext.Current.Response.End();