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You may still not yet see how this is incredibly cool, so let me give you a custom example. Let s say that you have a legal statement that you need to include with every item based on a certain content type, such as something about the release of liability to your financial documents in our hierarchy example. You have a few options. First, you can modify the forms or pages to display a static legal disclaimer, but sadly, since a content type based item can move around, you would need to modify every single page. Besides, if you have different legal statements for each content type you are out of luck.

In ASP.NET version 2.0, the CacheDependency class is no longer defined as NotInheritable, so it s Tip possible to create your own dependency classes with custom logic to determine cache item removal. In fact, the new SqlCacheDependency class that is available in version 2.0, for invalidating cache items based on changes on a database, is implemented exactly that way by deriving from CacheDependency.

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In case you re wondering, the final argument is of type CacheItemRemovedCallback, and it allows you to ask for notification whenever the cached item is evicted from the cache. You can write a custom method (like the ItemRemovedCallback() method here), and then specify that method in the seventh argument, as follows: Public Sub ItemRemovedCallback(ByVal key As String, ByVal value As Object, _ ByVal reason As CacheItemRemovedReason) ' This method will be called when the our item expires End Sub ... other code ... Cache.Add("MembersDataSet", dsMembers, Nothing, _ DateTime.MaxValue, TimeSpan.FromMinutes(5), _ Normal, _ New CacheItemRemovedCallback(Me.ItemRemovedCallback))

Second, you can store the legal statement in the item itself. Of course, this would mean updating every single item if you change the statement, not to mention that you would be storing the statement about a gazillion times. The perfect solution is to use a custom XmlDocument element. Not only would every child element get the statement, but you could have different statements for each child. When you add the information in the earlier caution to the mix (you did read that, right ), you know that updating the parent statement will not affect the children, unless you want it to do so.

Figure 14-12. Executing the database table update 13. Return back to the running Default.aspx Web Form, and click the browser Refresh button. Notice that the time has changed on the page along with the newly added entry (Figure 14-13).

Note that the ItemRemovedCallback() method (which is called whenever the cached item expires) has three arguments The first is the key we used when we stored the item in the cache, the second is the stored object itself, and the third is the reason the item was evicted There are four possible reasons listed in the CacheItemRemovedReason enumeration: DependencyChanged, Expired, Removed, and Underused At least a couple of places in the Friends Reunion application would benefit from some careful application of data caching In particular, every time we perform an expensive query to the database and then hold the results in a DataSet, we can take the opportunity to cache the DataSet and avoid regenerating it unnecessarily for each request Try It Out: Cache Places-Related Data In this example, you ll use data caching in the pages that deal with all the places available to the application.

You use this data in different pages and hit the database to get it each time If you cache the data, and then use the cached data in any page that needs it, the resulting reduction in the demands on the server and network should give an overall performance boost In particular, AssignPlacesaspx includes a drop-down list that shows a list of available places Let s use our new data-caching skills there 1 Open AssignPlacesaspxvb Change the LoadDataSet() method by removing all the code used to get the Places data from the database To do this, you just need to remove (or comment out) the following lines: Private Sub LoadDataSet() Dim con As New SqlConnection( _ "data source=;initial catalog=FriendsData;" + _ "user id=apress;pwd=apress") ' Select the place's timelapse records, Dim sql As String sql = "SELECT " + _ "TimeLapse*, Place.

To put this in a language programmers will understand, think of XmlDocument elements as static Tip

Figure 14-13. Viewing the changes As a result of the SQL caching, the Web Form stayed within the cache and was served from it until a change was made to the database table. This technique can provide great optimization for web applications.

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