multiple Excel files download

Question

Hello All

 

Here I need to download multiple Excel sheets i use for loop. after one iterate loop I got am Exception like below

 

 Server cannot append header after HTTP headers have been sent.

 

 try

{ 

    for(some condition)

   { 

        //some code grid view// 

 

         Response.ClearContent();

         Response.Buffer = true;

         long lnUserID = clsLists.getCurrentUserId(); 

         Response.AddHeader("content-disposition", "attachment; filename=Release-" + ReleaseEMCTSDB.users.SingleOrDefault(u => u.UserId ==

         l nUserID).UserName + "-" + DateTime.Now.ToString() + ".xls");

         Response.AppendHeader("Name", "Value");

         Response.ContentType = "application/ms-excel";

         Response.Charset = "";

         StringWriter sw = new StringWriter();

         HtmlTextWriter htw = new HtmlTextWriter(sw);

         string readergridview = sw.ToString();

         gv.RenderControl(htw);

         Response.Output.Write(sw.ToString());

         Resp onse.Flush();

         Response.End();

     } 

} 

try

{

 Exception

}

 

Please help me it is possible to iterate loop