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The implementation of cache invalidation with SQL Server 2000 has more overhead than the impleTip mentation with SQL Server 2005 and isn t as fine-grained. As a result, it doesn t make sense for tables that change frequently, or for narrowly defined queries that retrieve only a small subset of records from a table.

The next step is to instruct ASP.NET to poll the database. You do this on a per-application basis. In other words, every application that uses cache invalidation will hold a separate connection and poll the notification table on its own. To enable the polling service, you use the <sqlCacheDepency> element in the web.config file. You set the enabled attribute to true to turn it on, and you set the pollTime attribute to the number of milliseconds between each poll. (The higher the poll time, the longer the potential delay before a change is detected.) You also need to supply the connection string information. For example, this web.config file checks for updated notification information every 15 seconds:

Figure 9-6. Setting foreign key properties 9. Click OK and then click Close. 10. Save your table. Confirm the action when asked about applying changes to the Product and ShoppingCart tables.

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binding. As you might guess, it also has corresponding DeleteCommand, InsertCommand, and UpdateCommand properties, which allow you to do much more. Now that I ve tempted you with the possibilities, I m going to make you wait until 9 before you get to see these in action.

<configuration> <connectionStrings> <add name="Northwind" connectionString= "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI"/> </connectionStrings> <system.web> <caching> <sqlCacheDependency enabled="true" pollTime="15000" > <databases> <add name="Northwind" connectionStringName="Northwind" /> </databases> </sqlCacheDependency>

Now that you ve seen how to set up your database to support SQL Server notifications, the only remaining detail is the code, which is quite straightforward. You can use your cache dependency with programmatic data caching, a data source control, and output caching. For programmatic data caching, you need to create a new SqlCacheDependency and supply that to the Cache.Insert() method, much as you did with file dependencies. In the SqlCacheDependency constructor, you supply two strings. The first is the name of the database you defined in the <add> element in the <sqlCacheDependency> section of the web.config file. The second is the name of the linked table. Here s an example:

CartID is the unique ID you ll generate for each shopping cart. Unlike the other unique identifiers you ve seen so far, this is not an integer field; instead, it s a Char(36) field, which will be filled with a GUID string. A GUID (Globally Unique Identifier) is a value guaranteed to be unique across time and space. Two generated GUIDs will never be the same. The string representation of a GUID has 36 characters: The GUID itself is 32 bytes long, and its string representation also contains 4 separating dashes. An example of a GUID is ff8029a7-91e2-4ca2-b4e7-99a7588be751.

That completes the configuration of SqlDataSource1. All that s left is to tell the drop-down list about its data source. You do this by setting the DataSourceID property of DropDownList1 to SqlDataSource1. With the drop-down list, you re again making use of the DataBound event to add the dummy entry to the options available. The code is identical to the code you ve used in the previous two examples. Once you ve configured the DropDownList and the SqlDataSource that it s binding to, you don t need to worry about the data binding, as it takes place automatically between the OnPreRender and OnPreRenderComplete events in the page life cycle. And it s here that ASP.NET applies some intelligence to the data binding. In the previous examples, the first decision you had to make within the Page_Load event was whether you needed to bind the DropDownList. You ll recall that you need to do this only once, as the contents of the list are remembered across postbacks. The DropDownList is intelligent enough to know when it needs to bind to the data source and does this only the first time the page is loaded. You can see this by adding a breakpoint to the DataBound event and watch how many times it s reached only once when the page is first loaded.

' Create a dependency for the Employees table. Dim empDependency As New SqlCacheDependency("Northwind", "Employees") ' Add a cache item that will be invalidated if this table changes. Cache.Insert("Employees", dsEmployees, empDependency)

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