private async void btnAdd_Click(object sender, EventArgs e) { Product product = new Product() { ProductName = txtProductName.Text, CategoryId = (int)cmbCategories.SelectedValue, UnitPrice = decimal.Parse(txtUnitPrice.Text), UnitsInStock = short.Parse(txtUnitsInStock.Text) }; bool result = await _productPrecessor.AddProduct(product); await GetList(); }