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Isolated storage is not unlimited. Administrators can set user quota restrictions that limit the amount of data that can be stored in isolated storage, so it is not suited for large amounts of data. The default size of isolated storage for in-browser Silverlight applications is 1MB. The default size of isolated storage for out-of-browser Silverlight applications at install time (called detach) is 25MB.

Note Isolated storage is not encrypted, though developers can encrypt and decrypt files stored in local storage

The quota can be increased further by the user through the UI thread, usually as a result of a UI event handler. Otherwise, the quota cannot be increased on a background thread or without user

3. If any JavaScript events are triggered, the ZK client engine will send those events (that is, those Ajax requests) back to ZK AU engine on the server side. 4. The ZK AU engine receives the Ajax requests, updates the properties of ZK components, and sends an Ajax response back to the client side. 5. The ZK client engine receives the response and updates the corresponding content in the browser s Document Object Model (DOM) tree. This process is constantly repeated until the URL is no longer referenced by the user.

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action. Isolated storage remains intact even if the browser cache is cleared, but isolated storage can be manually deleted by the user or application by using the File I/O classes. Applications can request more space by invoking the IsolatedStorageFile.IncreaseQuotaTo method in response to a user-initiated event, such as a mouse click or key press, as noted previously. To work with isolated storage, first obtain an isolated store for the application using the IsolatedStorageFile.GetUserStoreForApplication method. This returns an IsolatedStorageFile object, which you can use to create directories using the CreateDirectory method and files using the CreateFile method. The CreateFile method returns an IsolatedStorageFileStream object. The IsolatedStorageFileStream class inherits from FileStream, so you can use the class with StreamReader and StreamWriter objects. Another option is to use the IsolatedStorageSettings class, which is a Dictionary object that can be used to quickly store key/value pairs in isolated storage.

To test isolated storage, your sample does two things. It allows a user to store and update a setting using the IsolatedStorageSettings class and to save and reload form state between browser sessions. Figure 2-11 shows the UI with a mock form.

The Silverlight application shown in Figure 2-11 has a TextBox on the left with Hi There Book Reader! as a value. Any value entered in this TextBox is stored in the IsolatedStorageSettings dictionary object, which is a convenient place to store name/value pair settings or data. The UserControl.Loaded event handler pulls this setting out of the collection, and the ButtonUpdateSetting event handler stores the setting when the Button titled Update Setting is clicked. The Save Form Data button and the Load Form Data button both work with the sample form fields located in the rounded green/silver area on the right side of the application. The Save Form Data button concatenates the text from the form data into a string, with each value separated by the pipe (|)

1. Normally I would put the URL here so you could look it up. But that old article I wrote in my youth is just ridiculous, so, while it s still on the Web, you ll have to find it for yourself, which I don t recommend.

Consequently, in the SendCompleted event handler, you should check the SendCompletedEventArgs.Error property of type Exception for any exception that may be raised in the event of an unsuccessful send attempt. In case of a send-related error, this may be set to an instance of System.Windows.Messaging.SendFailedException. If the send was successful, the SendCompletedEventArgs.Response may contain a response message, depending on whether the receiver sent a response back.

ZK is designed to be as thin as possible, so it focuses only on the presentation tier. It does not require any other back-end technologies, and all of your favorite middleware, such as Java Database Connectivity (JDBC), Hibernate, Java Mail, Enterprise Java Beans (EJBs), and Java Message Service (JMS), works appropriately with ZK. Thus, you can build your web application with familiar technologies without learning new ones.

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