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To perform the same trick with output caching, you simply need to set the SqlCacheDependency property of the OutputCache directive. Use the database dependency name and the table name, separated by a colon:

Tip When you know the exact length of the strings you re storing in a table field, it s better to use the Char

In the previous examples, you ve had to respond to the OnSelectedIndexChanged event to pass a SQL query to the GridView and tell it to bind itself. We ll look at the GridView in a lot more detail in the next chapter, when we cover table binding. Here, we ll look at how the SQL query that is executed is constructed. If you take a look at the data source for the GridView, SqlDataSource2, you ll see that it s remarkably similar to the data source that you ve used for the DropDownList: <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>" SelectCommand="SELECT PlayerID, PlayerName, PlayerManufacturerID, PlayerStorePrice, PlayerStorage FROM dbo.Player WHERE (PlayerManufacturerID = @ManufacturerID)">

The same technique works with the SqlDataSource and ObjectDataSource controls:

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SQL Server 2005 gets closest to the ideal notification solution, because the notification infrastructure is built into the database with a messaging system called the Service Broker. The Service Broker manages queues, which are database objects that have the same standing as tables, stored procedures, or views.

The second field is ProductID, which, as expected, holds the ID of an existing product. To ensure that the cart doesn t hold any nonexistent products, you need to enforce the One-to-Many relationship between the ShoppingCart and Product tables through a FOREIGN KEY constraint. The relationship is tied between the ProductID columns in the ShoppingCart and Product tables.

<SelectParameters> <asp:ControlParameter ControlID="lstManufacturers" Name="ManufacturerID" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> There s a ConnectionString that points to the correct database, and again, you have a SelectCommand that details the query that you want to execute. There s also a new child element, SelectParameters, which you haven t seen before. The SelectParameters collection allows you to specify various parameters to the SelectCommand query, as shown in Table 6-2.

Essentially, you can instruct SQL Server 2005 to send notifications for specific events using the CREATE EVENT NOTIFICATION command ASP NET offers a higher-level model you register a query, and ASPNET automatically instructs SQL Server 2005 to send notifications for any operations that would affect the results of that query This mechanism works in a similar way to indexed views Every time you perform an operation, SQL Server determines whether your operation affects a registered command If it does, SQL Server sends a notification message and stops the notification process When using notification with SQL Server, you get the following benefits over SQL Server 2000: Notification is much more fine-grained: Instead of invalidating your cached object when the table changes, SQL Server 2005 invalidates your object only when a row that affects your query is inserted, updated, or deleted.

Notification is more intelligent: A notification message is sent the first time the data is changed but not if the data is changed again (unless you reregister for notification messages by adding an item back to the cache) No special steps are required to set up notification: You do not run aspnet_regsql or add polling settings to the webconfig file However, you do need to call the shared SqlDependencyStart() method somewhere in your code to start the polling service Notifications work with SELECT queries and stored procedures However, some restrictions exist for the SELECT syntax you can use To properly support notifications, your command must adhere to the following rules: You must fully qualify table names in the form [Owner]table, as in dboEmployees (not just Employees) Your query cannot use an aggregate function, such as COUNT(), MAX(), MIN(), or AVERAGE().

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