protected void AjaxFileUpload1_UploadStart(object sender, AjaxControlToolkit.AjaxFileUploadStartEventArgs e)
 {
     this.Session["file2"] = new ArrayList();
 }
 protected void AjaxFileUploadDocument_UploadStart(object sender, AjaxControlToolkit.AjaxFileUploadStartEventArgs e)
 {
 }