private void add_worker_btn_Click(object sender, RoutedEventArgs e)
{
this.Hide();
AddWorker addWorker = new AddWorker();
addWorker.ShowDialog();
}
private void add_worker_btn_Click(object sender, RoutedEventArgs e)
{
this.Hide();
AddWorker addWorker = new AddWorker(emp_dtgrid, db1);
addWorker.ShowDialog();
emp_dtgrid.ItemsSource = db1.employee.ToList();
this.Show();
}