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</configuration> If you re familiar with XML, you ll recognize Listing 4-5 as a simple, well-formed XML document. In 8, we ll discuss XML, but in the meantime, you ll need to be aware of the following aspects of XML: XML always uses matched start and end tags, unlike HTML, which allows omission of many end tags. For some tags, the start and end tags can be represented as a single tag. For example, the following tag is valid: <compilation debug="true" /> XML is case-sensitive. Thus, the following tag is not valid, because </Compilation> is not seen as a closing tag for <compilation>: <compilation debug="true"> </Compilation> Although early betas of the .NET Framework were forgiving about the case of attributes values (for example, true and True were considered the same), from Beta 2 onward, the configuration files are, correctly, completely case-sensitive. XML values are enclosed in quotation marks. Thus, the following tag is not valid: <compilation debug=true /> XML is the preferred data language of the .NET Framework. As of this writing, however, no automated administrative tool is available for editing the Web.config file. This isn t a terrible problem because XML is an easy format to follow, but it does mean that you ll need to manually tweak these files using a normal editor program such as Notepad (known affectionately as Notepad.NET to some of the early ASP.NET adopters). I won t cover all the many possible configuration options because they re described in the .NET Framework Software Development Kit (SDK) documentation; however, I will go through the important configuration options and their implications and explain each of the sections of the Web.config file.

Limits Logging to Wait-related functions Thread-related functions Critical-section functions Mutex functions Semaphore functions Event functions All hooked functions

Notice that the page sets the authentication cookie manually by calling FormsAuthenticati on .SetAuthCookie, and then redirects the processing back to the page . Each time the page shows, it calls the ShowContent method, which checks the authentication property in the page to decide whether to display content specialized for an authenticated user . Because the page redirects manually after authenticating, the web .config file needs to look a bit different . To make it work, the authentication node should remain, but the authorization node that denies anonymous users needs to be removed . That way, any user can log in to the OptionalLogin .aspx page they won t be denied and they can proceed after they are authenticated . The new web .config file is shown in Listing 9-4 . The file on the accompanying CD is named Web .ConfigForOptionalLogin . To make it apply to the application, copy the file and name it web.config .

Clicking Chat opens a chat pane that works much like an instant messaging program. Either party can send a file from their own computer to the other. The recipient must approve the transfer before it begins. Clicking Help displays a list of Remote Assistance topics in Help And Support.