public void Update(Patient entity)
 {
     var result = _dbSet.Find(entity.id);
     result.FirstName = entity.FirstName;
     result.LastName = entity.LastName;
     result.SexOfThePatient = entity.SexOfThePatient;
     result.Age = entity.Age;
     _db.SaveChanges();
 }
 public Patient Insert(Patient entity)
 {
     var res = _dbSet.Add(entity);
     _db.SaveChanges();
     return res;
 }