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Note that the Init and Dispose methods are quite different from well-known event handlers such as Application_Start and Application_End. Init executes for every request directed to the Web application, whereas Application_Start fires only once in the Web application s lifetime. Init indicates that a new instance of the HttpApplication class has been initialized to serve an incoming request; Application_Start denotes that the first instance of the HttpApplication class has been created to start up the Web application and serve its very first request. Likewise, Dispose signals the next termination of the request processing but not necessarily the end of the application. Application_End is raised only once, when the application is being shut down. Note The lifetime of any resources created in the Init method is limited to the execution of the

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Public Function LoadPostData(ByVal postDataKey As String, _ ByVal postCollection As NameValueCollection) As Boolean _ Implements IPostBackDataHandler.LoadPostData The posted value is equal to the index of the selected element. SelectedIndex = CInt(postCollection(postDataKey)) End Function Public Sub RaisePostDataChangedEvent() _ Implements IPostBackDataHandler.RaisePostDataChangedEvent Nothing to do for now. End Sub

current request. Any resource you allocate in Init should be disposed of in Dispose, at the latest. If you need persistent data, resort to other objects that form the application or session state.

In addition to the operational methods in Table 16-3, a few other HttpApplication methods are available to register asynchronous handlers for application-level events. These methods are of little interest to user applications and are used only by HTTP modules to hook up the events generated during the request s chain of execution.

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ZXing ("Zebra Crossing") barcode scanning library for Java, Android - zxing / zxing . ... The Barcode Scanner app can no longer be published, so it's unlikely any changes will be accepted for it. There is otherwise ... ZXing . NET , port to . NET and C#, and related Windows platform ... QR code is trademarked by Denso Wave, inc.

If you now rebuild the ComboBoxEx control and run the demo application (or just run the complete project in the companion code), you ll see that the SelectedIndex prop erty is correctly preserved between postbacks and that the ComboBoxEx control works as expected. You might have noticed that the RaisePostDataChangedEvent method of the IPostBackDataHandler interface is left empty. The purpose of this method will become clear in the next section.

Table 16-4 describes the event model of the HttpApplication class that is, the set of events that HTTP modules, as well as user applications, can listen to and handle.

The ComboBoxEx control still lacks a SelectedIndexChanged event. You already know how to declare an event in a class:

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Select the Button2 control and then type Add Reports in the control s Text property in the Properties window. Change the Enabled property for the Button2 control to False. As you saw in the previous procedure, items do not display in the ListView control until you use the Find Items By Name button. By disabling the Button2 control when the form is first executed, you can require a user to retrieve items first so that a folder can be selected from the resulting list. You will change the code for the Find Items By Name button (the Button1 control) to enable the Button2 control once a list has been created. Select the Button3 control, and then type Delete Items in the control s Text property in the Properties window. Resize the button, if necessary, to view the entire text. Change the Enabled property for the Button3 control to False. This control works like the Button2 control and requires a user to select an item before an operation can be performed. Consequently, you will enable this button only when the user has requested a list by using the Find Items By Name button. Switch to the code page (the myRSManager.vb form) and then remove the single quote from the Button1_Click subroutine to uncomment the lines Button2.Enabled = True and Button3.Enabled = True.

TABLE 16-4

Event SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)

Occurs when the handler that will actually serve the request acquires the state information associated with the request. Occurs when a security module has established the identity of the user. Occurs when a security module has verified user authorization. Occurs as soon as the HTTP pipeline begins to process the request. Occurs when the HttpApplication object is disposed of as a result of a call to Dispose. Occurs as the last event in the HTTP pipeline chain of execution. Occurs when an unhandled exception is thrown. Occurs when the system logs the results of the request. Occurs when the HTTP handler to serve the request has been found.

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