private void AddWorkerButton_Click(object sender, RoutedEventArgs e)
{
string name = NameTextBox.Text;
string telephone = TelephoneTextBox.Text;
string address = AddressTextBox.Text;
string lN = LNTextBox.Text;
int type = ((employee_type)EmployeeTypeComboBox.SelectedItem).Id;
employee o = new employee(); //יצירת אובייקט עובד חדש
o.name = name;
o.telephone = telephone;
o.address = address;
o.license_number = lN;
o.employee_type_id = type;
db.employee.Add(o);
db.SaveChanges();
this.Close();
}