public JsonResult GetUsersByProjects(List <int> projectIds)
 {
     if (projectIds != null && projectIds.Count > 0)
     {
         List <ApplicationUser> UserList = new List <ApplicationUser>();
         foreach (var projectId in projectIds)
         {
             UserList.AddRange(projectHelper.ListUsersOnProject(projectId).Except(UserList));
         }
         List <HomeUserTable> response = CreateHomeUserTable(UserList);
         return(Json(response));
     }
     else
     {
         return(Json(null));
     }
 }