public void AddDoctor(Doctor doctor)
{
if (!Validation.IsId(doctor.Id))
{
throw new Exception("This ID isn't valid");
}
if (!Validation.ValidIdDB(doctor.Id))
{
throw new Exception("This ID already exists");
}
if (!Validation.IsEmail(doctor.Mail))
{
throw new Exception("This email isn't valid");
}
dal.AddDoctor(doctor);
}
