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Now that you ve learned the stages of web forms processing, it s time to take a closer look at how the server control model plugs into this pipeline. To render a page, the web form needs to collaborate with all its constituent controls. Essentially, the web form renders itself and then asks all the controls on the page to render themselves. In turn, each of those controls can contain child controls; each is also responsible for their own rendering code. As these controls render themselves, the page assembles the generated HTML into a complete page. This process may seem a little complex at first, but it allows for an amazing amount of power and flexibility in creating rich web-page interfaces. When ASP.NET first creates a page (in response to an HTTP request), it inspects the .aspx file. For each control tag it finds, it creates and configures a control object, and then it adds this control as a child control of the page. You can examine the Page.Controls collection to find all the child controls on the page.

Instead of defining a feature at a high level, specific details are far more useful when viewing a specific property. The model forms a bridge between and , providing a way to describe the individual features of a specific property.

names (which are strings) that are associated with this role. The serialized version of an array of users will be the user store, while the serialized version of an array of roles will be the roles store, as shown in Figure 26-3.

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Figure 26-3. Serialized versions of the SimpleUser/SimpleRole arrays Another design aspect you have to think about is how to access the store. Basically, for every store, you need only one instance in memory in order to save resources and avoid loading the XML files too often. You can implement this through the Singleton pattern, which is a solution for ensuring that only one instance of a class exists within a process. It does this by making the constructor private and providing a static public method for retrieving an instance. This public method verifies whether the instance already exists, and if not, it automatically creates an instance of its own, which is then returned. Let s examine all these aspects based on the UserStore class introduced in Figure 26-3: private string _FileName; private List<SimpleUser> _Users; private XmlSerializer _Serializer; private static Dictionary<string, UserStore> _RegisteredStores; private UserStore(string fileName) { _FileName = fileName; _Users = new List<SimpleUser>(); _Serializer = new XmlSerializer(typeof(List<SimpleUser>));

LoadStore(_FileName); } public static UserStore GetStore(string fileName) { // Create the registered store if it does not exist yet if (_RegisteredStores == null) _RegisteredStores = new Dictionary<string, UserStore>(); // Now return the appropriate store for the filename passed in if (!_RegisteredStores.ContainsKey(fileName)) { _RegisteredStores.Add(fileName, new UserStore(fileName)); } return _RegisteredStores[fileName]; } The class includes a couple of private members for the filename of the store, the list of users, and an XmlSerializer instance used for reading and writing data. Because the constructor is private, instances can t be created outside the class. Outside classes can retrieve instances only by calling the public static GetStore() method. The implementation of the Singleton pattern is special in this case. It creates single instances based on the filenames. For every file processed by the provider, one instance of the UserStore class is created. If more than one web application using this provider is running in the same process, you need to ensure that different instances are created for different filenames. Therefore, the class doesn t manage one static variable for a single instance; instead, it has a dictionary containing all the instances of the class, one for every filename. Because you are using XML serialization to save and load data to and from the store, the functions for loading the store and saving data back to the store are fairly easy: private void LoadStore(string fileName) { try { if (System.IO.File.Exists(fileName)) { using (XmlTextReader reader = new XmlTextReader(fileName)) { _Users = (List<SimpleUser>)_Serializer.Deserialize(reader); } } } catch (Exception ex) { throw new Exception( string.Format("Unable to load file {0}", fileName), ex); } } private void SaveStore(string fileName) { try { if (System.IO.File.Exists(fileName)) System.IO.File.Delete(fileName);

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