public void deleteSpecialization(Specialization s)
{
var em = dal.GetAllEmployee();
foreach (var item in em)
{
if (item.SpecializationNumber == s.number)
{
throw new Exception("You can't delete the specialization.\n Because there is an employee realted to it!!!");
}
}
try
{
dal.deleteSpecialization(s);
}
catch (InvalidCastException e)
{
throw e;
}
}
public List <Employee> GetAllEmployee()
{
return(dal.GetAllEmployee());
}