private void BtnNovo_Click(object sender, EventArgs e)
{
var frm = new FrmCliente();
frm.ShowDialog();
ListarClientes();
}
private void DgvClientes_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
int id = int.Parse(dgvClientes.Rows[e.RowIndex].Cells[0].Value.ToString());
var frm = new FrmCliente(id);
frm.ShowDialog();
ListarClientes();
}