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In the Internet age, in which you don t know your users up front, you cannot rely on the possibility of creating a direct TCP connection between the client and the server. Your users might be sitting behind a firewall that only allows HTTP traffic to pass through. The same router will block any pings the server might send to your users. Because of those issues, the .NET Remoting lifetime service is customizable as well. By default an object will get a lifetime assigned to it, and each call from the client will reset this time to live. The .NET Framework also allows a socalled sponsor to be registered with a server-side object. It will be contacted just before the lifetime is over and can also increase the object s time to live. The combination of these two approaches allows for a configurable lifetime service that does not depend on any specific connection from the server to the client.

Figure 4-7. XML DataSet returned by GetUserADGroups web method call The IsUserInADGroupList() method can be tested in a similar fashion.

Note This is one of the core features of .NET Remoting: it never depends on any existing connections.

This recipe looks at the best ways to define distinct content blocks in applications for example, for the purposes of drag and drop.

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When you use remote objects (as opposed to using copies of remotely generated objects that are passed by value), .NET automatically keeps track of where they originated. So a client can ask one server to create an object and safely pass this as a method s parameter to another server. The second server will then directly execute its methods on the first server, without a round-trip through the client. Nevertheless, this also means there has to be a direct way of communication from the second server to the first one that is, there must not be a firewall in between, or at least the necessary ports should be opened.

Note Testing a web service this way works only on the computer on which the web service is running. If

In the following sections, you create a sample .NET Remoting application that demonstrates some of the concepts discussed earlier in this chapter. First and foremost, there are two very different kinds of objects when it comes to remoting: objects that are passed by reference and those that are passed by value. MarshalByRefObjects2 allow you to execute remote method calls on the server side. These objects will live on the server and only a so-called ObjRef will be passed around. You can think of the ObjRef as a networked pointer that shows on which server the object lives and contains an ID to uniquely identify the object. The client will usually not have the compiled objects in one of its assemblies; instead only an interface or a base class will be available. Every method, including property gets/sets, will be executed on the server. The .NET Framework s proxy objects will take care of all remoting tasks, so that the object will look just like a local one on the client. The second kind of objects will be referred to as ByValue objects or serializable objects throughout this book. When these objects are passed over remoting boundaries (as method parameters or return values), they are serialized into a string or a binary representation and restored as a copy on the other side of the communications channel. After this re-creation, there is no notation of client or server for this kind of object; each one has its own copy, and

When creating distinct content blocks in a Web application, you need to know the best way to define and manipulate them, whether that s through div or span elements, or through iframe elements.

2. Called so because every object of this kind has to extend System.MarshalByRefObject, or one of its children.

both run absolutely independently. Methods called on these objects will execute in the same context as the origination of the method call. For example, when the client calls a function on the server that returns a ByValue object, the object s state (its instance variables) will be transferred to the client and subsequent calls of methods will be executed directly on the client. This also means that the client has to have the compiled object in one of its assemblies. The only other requirement for an object to be passable by value is that it supports serialization. This is implemented using a class-level attribute: [Serializable]. In addition to this standard serialization method, you ll also be able to implement ISerializable, which I show you how to do in 6.

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