private void DgvMarcas_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            DataGridViewRow row   = this.DgvMarcas.SelectedRows[0];
            Marca           marca = new Marca();

            marca.IdMarca     = Int32.Parse(row.Cells[0].Value.ToString());
            marca.Descripcion = row.Cells[1].Value.ToString();
            marca.Estado      = row.Cells[2].Value.ToString();
            FrmMarcasEd fme = new FrmMarcasEd();

            fme.marca = marca;
            fme.ShowDialog();
        }
        private void CmdAgregar_Click(object sender, EventArgs e)
        {
            FrmMarcasEd fme = new FrmMarcasEd();

            fme.ShowDialog();
        }