private void button1_Click(object sender, EventArgs e)
        {
            CadMarca cad = new CadMarca();

            cad.ShowDialog();
            CarregarGrid();
        }
 private void btnEditar_Click(object sender, EventArgs e)
 {
     if (listView1.SelectedItems.Count > 0)
     {
         Marca marca = new Marca();
         marca.mar_id = Convert.ToInt32(listView1.SelectedItems[0].Text);
         CadMarca cad = new CadMarca(marca);
         cad.ShowDialog();
         CarregarGrid();
     }
     else
     {
         MessageBox.Show("Nenhum Registro Selecionado!");
     }
 }