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'*************************************************************************** Public Shared Sub SaveMyPrimeList() WriteValueToDatabase("MyPrimeList", SerializeToXML(_MyPrimeList)) End Sub A bit more code is involved with serialization and deserialization because it is a bit more complicated. In this property, you first check to see if the value has already been cached. If not, the XML associated with the "MyPrimeList" setting is acquired from the database. If the XML is an empty string, then the property returns Nothing. Otherwise, the XML is deserialized, and the resulting object is cached. At this point, if the cached variable is still nothing, a new ArrayList is created and assigned to the cache. This ensures that you will have an object with which to work, even if your database does not contain any XML to create the object. Finally, the property returns the cache variable. The Set portion of the property sets the MyPrimeList cache variable equal to the incoming value. It then calls SaveMyPrimeList, which is responsible for serializing the object to XML and then writing that XML back out to the database. You may be wondering why there is a special function to save the MyPrimeList value to the database. Any time you change a property that is a native type (String, Integer, Date, and so on), then the code in the Set portion of the property executes. When you are working with objects, such as an ArrayList, the Set code only executes when an actual object assignment is made. Other changes to ArrayList objects occur at the object level, so the Set code is never called. Here s an example: MyPrimeList = new ArrayList() MyPrimeList.Add(11) 'This causes the Set code to fire. 'This causes the Get code to fire

You need a highly dynamic site map that s generated on the fly. For example, you might want to generate a different site map based on the current user, the query string parameters, and so on. You need to change one of the limitations in the XmlSiteMapProvider implementation. For example, maybe you want the ability to have nodes with duplicate URLs. You have two choices when implementing a custom site map provider. All site map providers derive from the abstract base class SiteMapProvider in the System.Web namespace. You can derive from this class to implement a new provider from scratch. However, if you want to keep the same logic but use a different data store, just derive from the StaticSiteMapProvider class instead. It gives you a basic implementation of many methods, including the logic for node storing and searching. In the following sections, you ll see a custom provider that lets you store site map information in a database.

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The output that is sent to the browser by ViewState overcomes one of the big weaknesses of other client-side state systems whose values can be mimicked in an attempt to spoof the server. Any attempts to manipulate ViewState outside of the page s life cycle process will be detected by the ASP.NET, minimizing the possibility of tampering.

In this example, all navigation links are stored in a single database table. Because databases don t lend themselves easily to hierarchical data, you need to be a little crafty. In this example, each navigation link is linked to a parent link in the same table, except for the root node. This means that although the navigational links are flattened into one table, you can re-create the right structure by starting with the home page and then searching for the subset of rows at each level. Figure 16-14 shows the SiteMap table with some sample data that roughly duplicates the site map you saw earlier in this chapter.

In the first line, you are making an assignment and setting the property equal to a new ArrayList, so the Set portion of the property fires and MyPrimeList is saved. In the second line, however, you are actually using the Get portion of the property to acquire the ArrayList and, after you have it, calling the Add function on the object itself. It s a subtle distinction, but it means that changes made to the MyPrimeList itself will not save the object automatically. Thus, you need the auxiliary function to explicitly save the object after an update: MyPrimeList.Add(11) Config.SaveMyPrimeList() 'Update the object 'Explicitly Save MyPrimeList

Figure 16-14. The SiteMap table In this solution, the site map provider won t access the table directly. Instead, it will use a stored procedure. This gives some added flexibility and potentially allows you to store your navigation information with a different schema, as long as you return a table with the expected column names from your stored procedure. Here s the stored procedure used in this example: CREATE PROCEDURE GetSiteMap AS SELECT * FROM SiteMap GO

Having a tamper-resistant, efficient state management technology is one thing, but what truly makes ViewState successful is how easy it is to put to work. Using ViewState is like using any of the collection types available in .NET. The following code snippet adds the value writebook with a key value of task: ViewState["task"] = "writebook";

Because this site map provider doesn t change the underlying logic of site map navigation, you can derive from StaticSiteMapProvider instead of deriving from SiteMapProvider and reimplementing all the tracking and navigation behavior (which is a much more tedious task).

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