private void dgvProducts_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            int        index      = dgvProducts.CurrentRow.Index;
            Guid       productId  = new Guid(dgvProducts.Rows[index].Cells["ProductId"].Value.ToString());
            Product    product    = new Product(productId);
            frmProduct frmProduct = new frmProduct(frmMain_Parent, product);

            frmProduct.FormClosed += frmProduct_FormClosed;
        }
        private void btnNewProduct_Click(object sender, EventArgs e)
        {
            frmProduct frmProduct = new frmProduct(frmMain_Parent, CurrentRK);

            frmProduct.FormClosed += frmProduct_FormClosed;
        }