private void btnAdd_Click(object sender, EventArgs e)
        {
            FrmBrand frmBrand = new FrmBrand();

            frmBrand.ShowDialog();
            FillDataGridViewBrandsAsync();
        }
 private void btnUpdateBrand_Click(object sender, EventArgs e)
 {
     if (dgvBrands.SelectedRows.Count > 0)
     {
         int idSelectedBrand = Convert.ToInt32(dgvBrands.SelectedRows[0].Cells[0].Value);
         IRepositoryGeneric <Brand> repositoryBrand = new RepositoryBrand();
         Brand    brandToBeChanged = repositoryBrand.SelectById(idSelectedBrand);
         FrmBrand frmBrand         = new FrmBrand(brandToBeChanged);
         frmBrand.ShowDialog();
         FillDataGridViewBrandsAsync();
         FillDataGridViewProducsAsync();
     }
     else
     {
         MessageBox.Show("Please select one brand first.", "Error", MessageBoxButtons.OK,
                         MessageBoxIcon.Warning);
     }
 }