private void btnEdit_Click(object sender, EventArgs e)
        {
            if (productGridView.SelectedRows.Count > 0)
            {
                DataGridViewRow dataRow = productGridView.SelectedRows[0];
                int.TryParse(dataRow.Cells["id"].Value.ToString(), out int id);
                if (id < 0)
                {
                    return;
                }

                var frmProductAdd = new frmProductAdd(this, userId, id);
                frmProductAdd.ShowDialog();
            }
            else
            {
                MessageBox.Show("Please select a brand to update");
            }
        }
        private void dataRowDouble_Click(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex < 0)
            {
                return;
            }

            var dataRow = productGridView.Rows[e.RowIndex];

            int.TryParse(dataRow.Cells["id"].Value.ToString(), out int id);
            if (id < 0)
            {
                return;
            }

            var frmProductAdd = new frmProductAdd(this, userId, id);

            frmProductAdd.ShowDialog();
        }
        private void btnAdd_Click(object sender, EventArgs e)
        {
            var frmProductAdd = new frmProductAdd(this, userId);

            frmProductAdd.ShowDialog();
        }