private void dgLoja_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            string  idItem   = dgLoja.CurrentRow.Cells[0].Value.ToString();
            frmItem formItem = new frmItem(idItem, carrinho);

            formItem.ShowDialog();
        }
        private void dgLoja_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            string idItem = dgLoja.CurrentRow.Cells[0].Value.ToString();
            frmItem formItem = new frmItem(idItem, carrinho);
            formItem.ShowDialog();

        }