private void btnNovo_Click(object sender, System.EventArgs e)
        {
            var frm = new NovoContatoForm(contatosService);

            frm.ShowDialog();
            CarregarContatos();
        }
        private void EditarContato(DataGridViewCellEventArgs e)
        {
            int id  = (int)dataGridView1.Rows[e.RowIndex].Cells[this.id.Index].Value;
            var frm = new NovoContatoForm(contatosService, id);

            frm.ShowDialog();
            CarregarContatos();
        }