PORTAL MANAGEMENT in .NET

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SmtpClient mailClient = new SmtpClient("http://localhost"); mailClient.Send(from, to, subject, body); } }
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The code in listing 9.5 uses the GetLastError method of the Server object to access an instance of the actual error that occurred. Having the underlying exception object at our disposal provides access to a great deal of information about the error, such as the message of the exception and also a full stack trace of what was happening at the time the error occurred. We can use this information to diagnose what might have caused it.
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There s an excellent article on MSDN which discusses an extensible strategy for logging and reporting on errors that can be found at the following URL: http://msdn.microsoft.com/asp.net/default.aspx pull=/library/en-us/ dnaspp/html/elmah.asp
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Now that our application has logging code, Health Monitoring code, and a custom error page, you might think that the application will be resilient in all kinds of disasters and that we have little to worry about. But if you re taking off your shoes to put your feet up on the desk, take heed of the following scenario.
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A major selling point of web portals is that they facilitate the creation of modular user interfaces where we can deploy new web parts any time without having to re-publish an entire website. We saw this in chapter 8 with the custom dialog catalog, which allows us to add new web parts to our portal by simply dropping an assembly in the bin folder and then adding an entry to an XML file. Along with this ease of deployment comes the danger of deploying web parts that are not fully tested and contain errors. Think about what it would mean to deploy a web part which included a critical error and which threw an exception the instant it was added to the page. Once users added this web part to their pages, they would no longer be able to visit that page because the error page would be displayed instead. And because the users could not access their pages, they could not remove the web part. What to do We ve seen in chapters 5 and 6 that the WebPartPersonalization class has a method which allows us to reset the entire set of personalization data for a user for a single page by using its ResetPersonalizationState method like so:
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wpm.Personalization.ResetPersonalizationState()
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So when a user has broken his page, we can fix it by finding a way to load the broken pages into the current context and then calling ResetPersonalizationState on the page. There are two issues with this. First, how can we load the page into the current context given that it won t load Second, users will not be happy losing all their
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settings for a page that is heavily personalized, so ideally we need to provide a way that allows page resets to occur at a more granular level. We ll now investigate how to provide the users a self-management facility that allows them to go in and fix their own broken pages when this type of scenario occurs. 9.4.1 Self-maintenance of web parts In a presentation at the PDC conference in Los Angles in late 2005, Mike Harder, who is a Software Design Engineer on the ASP.NET team for the web parts feature, showed us how to provide user self-management. We ll now implement Mike s solution into our Adventure Works portal. First, let s summarize the steps a user performs so that we can see where we are headed. The user Adds a broken web part to his page Is instantly taken to a self-help administration page to fix the problem Removes the broken web part from the page Is returned to the original page and the error web part is no longer present
To implement this solution we will create an administration page that allows users to fix pages themselves. The page we ll create will display a list of web parts for a given page, and will allow the user to delete one or more web parts from that page. Figure 9.5
Figure 9.5 This grid displays all web parts for a given page and provides the user with a way to remove web parts which have caused the underlying page to stop working.
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