public void SetSubjectName()
        {
            string name = null;

            using (ai_databaseEntities de = new ai_databaseEntities())
            {
                name = de.Subject.Where(x => x.Id.Equals(this.subjectId)).FirstOrDefault().Name;
            }
            if (name != null)
            {
                this.subjectName = name;
            }
        }
        public void SetAddress()
        {
            string name = null;

            using (ai_databaseEntities de = new ai_databaseEntities())
            {
                int buildingId = de.Room.Where(x => x.Id.Equals(this.roomId)).FirstOrDefault().BuildingId;
                name = de.Building.Where(x => x.Id.Equals(buildingId)).FirstOrDefault().Address;
            }
            if (name != null)
            {
                this.address = name;
            }
        }