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The step to create the association comes before the call DataBind() is made (whether in code or automatically in the case of the SqlDataSource), and as such, means that a Web control or property can t be bound to data based on the values bound into some other Web control not unless you re using a postback in the page to react to choices made by the user. Inline binding is quite different from list or table binding at this stage, because you must associate the property with the column that will fill it in the HTML markup of the page, rather than the code. For those of you who have worked with classic ASP, inline binding is reminiscent of the way you inserted ASP code into pages. Let s say you wanted to bind the Text property of a Label. You would use the following in the page: <asp:Label id="Label1" runat="server" text="<%# expression %>"> The expression in the text must identify the source for the value you want bound to the Text property and must be surrounded by <%# ... %> tags. In contrast, list and table binding can be set up in both the code and the HTML markup of the page. For both, you need to set the DataSource or DataSourceID property for the Web control you re binding to the data source. If you re binding to a Web list control, you also need to set its DataValueField and DataTextField properties to the columns in your queried data.

At the end of this chapter, you ll have a functional shopping basket, but the visitor won t be able to order the products contained in it yet. You ll take care of that in the next chapter, where you ll implement a custom checkout, which includes adding the Proceed to Checkout button and the functionality to administer current orders. When the visitor clicks this button, the products in the shopping basket are saved as a separate order in the database, and the visitor is redirected to a page where payments are taken. If you integrated the PayPal shopping cart for the first development stage, starting with the next chapter, PayPal will only be used to handle payments, and you won t rely on its shopping cart any more. Before moving to the details, let s review what you ll do in this chapter: Design a shopping cart Add new data structures to store shopping cart records Implement the business tier methods to work with the shopping cart Implement the cart summary control and the shopping cart page and integrate them into the existing solution Create the shopping cart administration page

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This event handler raises an event to the web page, with information about the selected button. The RaisePostBackEvent() method can then trigger the GridClick event. Here s the complete, revised code for the ButtonGrid:

Public Class ButtonGrid Inherits System.Web.UI.Control Implements IPostBackEventHandler Public Event GridClick(ByVal Sender As Object, _ ByVal e As GridClickEventArgs) Public Sub New () Rows = 2 Cols = 2 End Sub Public Property Cols() As Integer Get Return CType(ViewState("Cols"), Integer) End Get Set(ByVal Value As Integer) ViewState("Cols") = Value End Set End Property Public Property Rows() As Integer Get Return CType(ViewState("Rows"), Integer) End Get Set(ByVal Value As Integer) ViewState("Rows") = Value End Set End Property Public Overridable Overloads Sub RaisePostBackEvent( _ ByVal eventArgument As String) _ Implements IPostBackEventHandler.RaisePostBackEvent

Note Inline binding is one of those things that you ll either love or you ll hate. Personally, it s something that I never do. ASP.NET was supposed to free us from the problems of spaghetti code, but using inline binding makes the code look like a plate of pasta. As you ll see after the Inline Binding section, you can accomplish the same task without relying on data binding.

At this stage of the site, you won t have any user-personalization features. You won t store any user data, and BalloonShop won t know who buys the products. We re just interested in having temporary shopping carts that can be transformed into orders and paid for through a service like PayPal when the visitors decide to buy the products. The payment service provider asks for the customers data (such as credit card information) when they decide to buy your products. When you add user-customization features in the later chapters, your task will be fairly simple: When the visitor places an order, the visitor s temporary (anonymous) shopping cart is associated with the visitor s account. Because you ll still work with temporary shopping carts, even after implementing the customer account system, the visitor still won t be required to supply additional information (log in or create an account) earlier than the checkout stage. Probably the best way to store shopping cart information is to generate a unique cart ID for each shopping cart and save it on the visitor s computer as a cookie and as session data. This way, even if the visitor has cookies disabled, the application can be configured to work fine by just relying on the visitor s session data. We ll discuss more about cookies and the session when we get to the business tier part.

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