public static void Add(int progdecId, int advisorId)
        {
            using (ProgDecEntities dc = new ProgDecEntities())
            {
                tblProgDecAdvisor pda = new tblProgDecAdvisor();
                pda.Id        = dc.tblProgDecAdvisors.Any() ? dc.tblProgDecAdvisors.Max(p => p.Id) + 1 : 1;
                pda.ProgDecId = progdecId;
                pda.AdvisorId = advisorId;

                dc.tblProgDecAdvisors.Add(pda);
                dc.SaveChanges();
            }
        }
        public static void Delete(int progdecId, int advisorId)
        {
            using (ProgDecEntities dc = new ProgDecEntities())
            {
                tblProgDecAdvisor pda = dc.tblProgDecAdvisors.FirstOrDefault(p => p.ProgDecId == progdecId && p.AdvisorId == advisorId);

                if (pda != null)
                {
                    dc.tblProgDecAdvisors.Remove(pda);
                    dc.SaveChanges();
                }
            }
        }