public List<Associate.Group> GetGroupsByUser(int uid)
 {
     using (AssociateConnDataContext asscon = new AssociateConnDataContext())
     {
         var groups = (from a in asscon.Get_GroupByID(uid)
                       select new Associate.Group()
                       {
                           GroupID = a.GroupID,
                           GroupDesc = a.GroupName
                       }).ToList<Associate.Group>();
         return groups;
     }
 }