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Passing logon credentials is one of the most crucial parts of VPN operations, and it s also one of the most dangerous. If logon credentials are compromised, the system is compromised as well. Some authentication protocols are easier to deploy than others, but you should consider the recommendations in the following paragraphs when choosing an authentication protocol for VPN connections. Microsoft recommends doing the following:

Each page you write that uses ASP.NET AJAX requires one (and only one) instance of a ScriptManager control. The ScriptManager control is responsible for pushing the Microsoft AJAX Library down to the client when your page is requested. It also manages partial-page updates, progress indicators, and more. You add the ScriptManager control to your page source. It does not have a visual representation. It is simply a control used to manage AJAX processing. The basic page markup for a ScriptManager control in Source view looks as follows.

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By default, the ScriptManager control s EnablePartialRending property is set to true. This indicates that the page supports partial-page updates. You can use this property to turn this feature off if needed. The ScriptManager control is also used to register custom scripts with the Microsoft AJAX Library. In this way, if you write a script, it can be registered and managed with the Microsoft AJAX Library. This is covered in Lesson 2 of this chapter. Similarly, you can use the ScriptManager control to register web service method calls from the client. This is covered in 10.

user certificates, use the EAP-TLS authentication protocol for both PPTP and L2TP connections. However, only VPN clients running Windows XP and Windows 2000 support EAP-TLS.

Value types have many purposes and allow for the more efficient use of resources What happens when you want to use a value type as an object For example, one of the methods of SystemObject is ToString, often used for debugging purposes The process is called boxing variables For example, suppose you have an int variable named i and you want to do something with a string representation of that variable Consider this code fragment: using System; class test { static void Main() { int i=5; object box=i; SystemConsoleWriteLine(boxToString()); SystemConsoleWriteLine(iToString()); SystemConsoleWriteLine(boxGetType()); SystemConsoleWriteLine(iGetType()); } } First we assign the integer i the value 5 Next we declare an object named box and assign it the value i.

You will often need to support AJAX in a user control you write or directly in the master page of a site. This presents an issue, because a page can contain only a single ScriptManager control. Having one inside your user control and another inside the page that consumes the user control, for example, would be a problem. To overcome this issue, you can use the ScriptManagerProxy control. The ScriptManagerProxy control can be used either by child pages that use a master page that already defines a ScriptManager control or by user and custom controls that you write. You use it much the same way you would a ScriptManager control. You can register scripts that are specific to the child page or control that you are writing. ASP.NET takes care of the rest.

The UpdatePanel control allows you to define areas of a page that should post back to the server independent of the rest of the page. This allows the client to work more independently. Rather than the entire page being requested and thus refreshed on return, with partial-page updates, you can post portions of a page to the server and receive updates to only those portions. In this way, the user does not see a full-screen refresh and does not lose context where he or she is on the page. It is important to note that partial-page updates give the illusion of running on the client side. However, they do not actually run on the client side. Rather, they are smaller, asynchronous postbacks to the server. The ScriptManager control manages the communication between this call and its return message. The UpdatePanel control is a container for other controls. The controls you put inside the UpdatePanel control that cause a postback to the server will be managed as partial-page updates. As an example, consider a GridView control that allows users to page through data. By default, each time the user selects another page of data, the entire webpage is refreshed and redisplayed. If you embed the GridView control inside an UpdatePanel, you can still process the data paging on the server. However, you now eliminate the full-page updates on the client. The following shows the markup of an UpdatePanel that includes a GridView control.