Adding AJAX | in .NET framework

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<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <asp:UpdatePanel id="UpdatePanel1" runat="server"> <ContentTemplate> ... all the content goes here ...
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</ContentTemplate> </asp:UpdatePanel> </asp:Content>
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The ScriptManager control should be on the master page, so you don t have to add one to every content page. So open MasterPage.master and drag a ScriptManager control onto the page, if it is not already there.
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Cart Page
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The Cart page displays the contents of the cart and allows you to remove items from the cart. It also provides a button to purchase the items in the cart, which would, of course, take you to the Purchase page.
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Of course, a full-featured cart would provide much more functionality than the simple cart shown here. For example, your fully featured commercial site might uses personalization to remember what was added to the cart in previous sessions and restore that information in a new session. It would almost certainly allow the user to change the quantity ordered of a given item, not to mention things such as size or color.
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Open Cart.aspx. Drag a SqlDataSource control onto the content area of the page. Set its ID to sqlCart. Configure it similar to the SqlDataSource in Example 10-8. Here is the markup for the control. It looks complex, but really it is a straightforward SELECT statement against the Production.Product table, with five joins:
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<asp:SqlDataSource ID="sqlCart" runat="server" ConnectionString="<%$ ConnectionStrings:AdventureWorksConnectionString %>" SelectCommand= "select product.ProductID, product.Name, product.ProductNumber, product.Color, subcat.Name as SubcategoryName, cat.Name as CategoryName, description.Description from Production.Product product join Production.ProductSubcategory subcat on product.ProductSubcategoryID = subcat.ProductSubcategoryID join Production.ProductCategory cat on subcat.ProductCategoryID = cat.ProductCategoryID join Production.ProductModel model on product.ProductModelID = model.ProductModelID join Production.ProductModelProductDescriptionCulture culture on model.ProductModelID = culture.ProductModelID join Production.ProductDescription description on culture.ProductDescriptionID = description.ProductDescriptionID"> </asp:SqlDataSource>
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This query needs a WHERE clause. The parameter in the WHERE clause needs to come from the Session object. ASP.NET actually makes this really easy under some circumstances but not these circumstances, as we will now describe. You saw previously in Example 10-8 the use of the <SelectParameters> element of the SqlDataSource, reproduced here, with a parameter based on the value of another control on the page:
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<SelectParameters> <asp:ControlParameter ControlID="gvProducts" Name="ProductID" PropertyName="SelectedDataKey.Values['ProductID']" /> </SelectParameters>
Cart Page |
There are other types of SelectParameters controls, including a SessionParameter, which comes from a Session object. The reason that will not work here is due to a quirk of the SQL used to construct the query. I ll explain. The cart is stored in a string as a comma-separated list of ProductIDs, which are stored in the database as integers. The query sent to the database has a where clause using the in keyword, as in:
where product.ProductID in (753,845,143) and culture.CultureID = 'en'
SQL Server knows that ProductID is an integer and is able to parse the contents of the parenthesis as a list of integers. However, when you use the SessionParameter control, it encloses the contents of the parenthesis with quotes, as in:
where product.ProductID in ("753,845,143") and culture.CultureID = 'en'
That makes it a string, and SQL Server cannot parse it as a set of integers. There may be a way to deal with this in SQL, but it is easier, and more instructive, to work around this by hooking in the Selecting event of the SqlDataSource control. This event is raised just before the query is sent to the database, and is a convenient time to modify the query. Add the code from Example 10-10 to handle this event (as well as events for two controls you will place on the page in just a moment). It retrieves the Session object and constructs the where clause, setting the CommandText subproperty of the event argument s Command property. Because this event is raised before the query is executed, changing the CommandText of the query allows you to modify the query before it is run; using this technique, you can have the WHERE clause refer to a specific ProductID.
Protected Sub sqlCart_Selecting(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.SqlDataSourceSelectingEventArgs) _ Handles sqlCart.Selecting Trace.Warn("sqlCart_Selecting") ' to aid in debugging
Dim strCart As String = String.Empty If Session("Cart") IsNot Nothing Then strCart = Session("Cart").ToString e.Command.CommandText &= " where product.ProductID in (" + _ strCart + _ ") and culture.CultureID = 'en' " Else e.Cancel = True End If End Sub
Protected Sub btnPurchase_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles btnPurchase.Click
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