protected void GV_RowCommand(object sender, GridViewCommandEventArgs e)
 {
     if (e.CommandName == "edit")
     {
         Response.Redirect("CustomerSetup.aspx?UserID=" + e.CommandArgument);
     }
     else if (e.CommandName == "delete")
     {
         int UserID = Convert.ToInt32(e.CommandArgument);
         using (PTCLEntities db = new PTCLEntities())
         {
             db.DeletePtlcUser(UserID);
         }
         FillUsers();
     }
 }