// vacancy
private void Edit_Vacancy(object sender, EventArgs e)
{
var ID = (int)vacancy.SelectedRows[0].Cells["id"].Value;
var change_vacancy = _db.Vacancy_details.FirstOrDefault(q => q.id == ID);
var EditVacancy = new EditVacancy(change_vacancy)
{
MdiParent = this.MdiParent
};
EditVacancy.ShowDialog();
// var change_vacancy = (int) vacancy.SelectedRows[0].Cells["id"].Value;
// var edit = new EditVacancy(change_vacancy);
// edit.Show();
}