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Visual Studio .NET makes it simple to generate the template for such event handlers. Just select the (BaseClassName Events) item in the left-most combo box above the code editor window, and then select an event in the right-most combo box. This programming technique doesn t require that you change the base class in any way, but it has a serious shortcoming. The derived class has no control over the event itself, and it can t modify its arguments or prevent it from firing. To solve this problem, you must change the way the base class fires events in other words, you must build the base class with inheritance in mind. Instead of using the RaiseEvent statement whenever you want to raise an event in the base class, you call an overridable method, which by convention is named OnEventname. Consider these two classes, with the base DataReader class raising a DataAvailable event when new data is available. The derived DataReaderEx class intercepts the event and exposes it to the outside only for the first 10 occurrences of the event itself:

To catch any unhandled exceptions wandering around a particular page, you define a handler for the Error event. Here s an example:

Click the View tab. The first page of the report, for calendar year 2001, is displayed. This presentation of the report is nearly identical to the version you saw in the Report Designer. You now have the HTML Viewer that includes a report toolbar to help you explore and interact with the report. For example, you can use controls in the toolbar to page through the report, to search for a string in the report, or to export the report to another format. The HTML Viewer is covered in more detail in 11, Accessing Reports. Click the Next Page button on the View toolbar to view the sales data for each year. Click the Help button on the View toolbar to review the documentation for the HTML Viewer, and then close the new browser window that was opened. The documentation for the HTML Viewer includes descriptions of each icon or control, the export formats available by default, and advanced report features such as parameter fields and credentials fields.

Class DataReader Event DataAvailable(ByVal sender As Object, ByVal e As EventArgs) Sub GetNewData() Should raise the event, but calls the Onxxxx method instead. OnDataAvailable(EventArgs.Empty) End Sub Protected Overridable Sub OnDataAvailable(ByVal e As EventArgs) Just raise the event. RaiseEvent DataAvailable(Me, e) End Sub End Class Class DataReaderEx Inherits DataReader A counter that is incremented after each event. Public EventCounter As Integer Protected Overrides Sub OnDataAvailable(ByVal e As EventArgs) Increment the counter. EventCounter += 1

protected void Page_Error(Object sender, EventArgs e) { // Capture the error var exception = Server.GetLastError(); // Resolve the error page based on the exception that occurred // and redirect to the appropriate page if (exception is NotImplementedException) Server.Transfer("/ErrorPages/NotImplErrorPage.aspx"); else Server.Transfer("/ErrorPages/GenericErrorPage.aspx"); // Clear the error Server.ClearError(); }

5:

You know about the raised exception through the GetLastError method of the Server object. In the Error handler, you can transfer control to a particular page and show a personalized

and exception-specific message to the user. The control is transferred to the error page, and the URL in the address bar of the browser doesn t change. If you use Server.Transfer to pass control, the exception information is maintained and the error page itself can call into GetLastError and display more detailed information. Finally, after the exception is fully handled, you clear the error by calling ClearError. Using Server.Transfer instead of Response.Redirect is also relevant from a Search-Engine Optimization (SEO) perspective because it performs a server-side redirect that is invisible to client applications, including Web browsers and, more importantly, Web spiders. Important When displaying error messages, pay attention not to hand out sensitive

Notice that the derived class can t directly use the RaiseEvent statement to raise one of its own events if the event is defined in the base class. The only way to indirectly raise the event is by calling the OnDataAvailable method in the base class, as shown in the preceding code. For consistency, Onxxxx methods should take an EventArgs-derived argument, even if it is an empty (and useless) EventArgs object as in this case.

information that a malicious user might use against your system. Sensitive data includes user names, file system paths, connection strings, and password-related information. You can make error pages smart enough to determine whether the user is local or whether a custom header is defined, and to display more details that can be helpful to diagnose errors: