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that takes no parameters Aside from these requirements, a browser-embeddable control is nothing special and does not require you to take any particular steps other than those you would take for any other kind of Windows Forms control Let's build a sample control named DataListView and make it inherit from the Windows Forms ListView control We will also add a new method that receives an XML string and loads the parsed text into a DataSet object If successful, the DataSet object will then be used to populate the view The input XML string can be set programmatically from any source and in particular can be extracted from a data island The DataListView Control The DataListView class inherits from ListView, but unlike the parent class, it always works in Details mode The view mode and the font are set during the initialization phase.

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Even though SomeOtherMethod s return type (Int32) is derived from MyCallback s return type (Object), this form of covariance is not allowed because Int32 is a value type . Obviously, the reason why value types and void cannot be used for covariance and contra-variance is because the memory structure for these things varies, whereas the memory structure for reference types is always a pointer . Fortunately, the C# compiler will produce an error if you attempt to do something that is not supported .

OSPF has faster convergence times. OSPF uses less network bandwidth. OSPF-calculated routes are always loopfree.

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I just explained how delegates can be used to call static methods, but they can also be used to call instance methods for a specific object . To understand how calling back an instance method works, look at the InstanceDelegateDemo method that appears in the code shown at the beginning of this chapter . Notice that a Program object named p is constructed in the InstanceDelegateDemo method . This Program object doesn t have any instance fields or properties associated with it; I created it merely for demonstration purposes . When the new Feedback delegate object is constructed in the call to the Counter method, its constructor is passed p.FeedbackToFile . This causes the delegate to wrap a reference to the FeedbackToFile method, which is an instance method (not a static method) . When Counter calls the callback method identified by its fb argument, the FeedbackToFile instance method is called, and the address of the

DHCP Relay Agent is a routing protocol that allows client computers to obtain an address from a DHCP server on a remote subnet. Typically, DHCP clients broadcast DHCPDiscover packets that are then received and answered by a DHCP server on the same subnet. Because routers block broadcasts, DHCP clients and servers must nor mally be located on the same physical subnet. However, two methods can help you work around this limitation. First, if the routers separating the DHCP server and clients are RFC 1542 compliant, the routers can be configured for Boot Protocol (BOOTP) forwarding. Through BOOTP forwarding, rout ers forward DHCP broadcasts between clients and servers and inform servers of the originating subnet of the DHCP requests. This process allows DHCP servers to assign addresses to the remote clients from the appropriate scope. The second way to allow remote communication between DHCP servers and clients is to configure a DHCP relay agent on the subnet containing the remote clients. DHCP relay agents intercept DHCP Discover packets and forward them to a remote DHCP server whose address has been preconfigured. Although DHCP Relay Agent is config ured through Routing And Remote Access, the computer hosting the agent does not need to be functioning as an actual router between subnets. Figure 9-35 shows a network topology with six subnets.

Exam Tip Expect to see a topology question about DHCP Relay Agent and RFC 1542 compliant routers on the exam.

recently constructed object p will be passed as the implicit this argument to the instance method . The FeedbackToFile method works as the FeedbackToConsole and FeedbackToMsgBox methods, except that it opens a file and appends the string to the end of the file . (The Status file that the method creates can be found in the application s AppBase directory .) Again, the purpose of this example is to demonstrate that delegates can wrap calls to instance methods as well as static methods . For instance methods, the delegate needs to know the instance of the object the method is going to operate on . Wrapping an instance method is useful because code inside the object can access the object s instance members . This means that the object can have some state that can be used while the callback method is doing its processing .

The following code is invoked from within the constructor: protected void SetupControl() { thisView = ViewDetails; thisFont = new Font("Verdana", 8f); thisFullRowSelect = true; } Although the control is automatically configured to work in Details mode, no columns are added to the view until the user interface is populated with data The Details view provides clickable columns of data arranged in a grid Populating the Control's User Interface Load is the key method of the DataListView control It is also the only extension made to the programming interface of the parent class, as shown here: public void Load(string xmldata) The Load method expects to receive an XML string that can be successfully parsed into a DataSet object The resultant object, if any, is used to populate the ListView class Unlike other list controls, the ListView class does not fully support the NET Framework's complex data-binding.

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