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The Domain Name System or DNS is a distributed naming system to identify computers on a network. It was developed by the U.S. military to enable computers to have unique names to communicate with each other properly. Before DNS, a computer s hosts file (called HOSTS, for example) was the only way to identify computers by hostname on a network. This file must be updated regularly by hand to inform the computer when a host is added or removed from the network. Because of the manual updates, naming conflicts that can cause confusion among hosts are common. The hosts file is still present on

public void Disconnect() { IChatClient clientCallback = OperationContext.Current.GetCallbackChannel<IChatClient>(); DisconnectClient(clientCallback); }

Once again, we get hold of the callback interface, and then call the same disconnection helper as the error-handling code. We have one more modification to make on the server: the wsHttpBinding we re using doesn t support the duplex behavior we require, so we need to modify the ChatHost program s configuration.

The next thing to do to our database is to populate it with records. Before you actually do that, we will create a fictional IT organization called My Domain organization. It consists of two groups: the programmers and the testers. You will record each user s name, serial number, and group to make things simple. Figure 16-12 shows the organizational table structure for our database.

As we mentioned earlier, WCF lets us change the communication mechanism we re using by configuring a different binding. We don t need to change any code to do this. We just need to modify our host project s App.config file, specifically the <endpoint> tag:

<endpoint address="" binding="wsHttpBinding" contract="ChatServerLibrary.IChatService"> </endpoint>

We change that binding attribute s value to wsDualHttpBinding. This binding is very similar to wsHttpBinding; it just adds support for callbacks. It also enables sessions automatically. (Sessions are available with wsHttpBinding, but they are off by default, so you d need to add further configuration to switch them on if you wanted sessions without duplex communication.) Our server is now ready to work in duplex mode, so next we need to update the client.

To create groups for our organization, you will create subtrees under the base DN. Subtrees can help you organize information into groups. They can be thought of as OpenLDAP s equivalent of the table in an RDBMS. The subtree will be added after the database s base DN, which will be discussed next.

We ve made several changes to the contract: we modified the one existing method, added two new methods, and turned it into a duplex contract. We also changed the binding. Any one of these changes would need the client to be updated, because each has an impact on the work done by the Add Service Reference operation. (All these things change the contract, the configuration, or both.) However, we don t need to completely redo the work of adding the service reference. If you right-click on an item in a client s Service References in the Solution Explorer, you ll see an Update Service Reference item. This modifies the generated source code and application configuration, saving you from having to build it all again from scratch. This refetches the metadata, so the service needs to be running when you do this, just as when adding the reference in the first place. Once we ve updated the reference, rebuilding the solution now produces two compiler errors. The call to PostNote fails, because we re passing in two arguments where the new contract requires only one. And we also see the following error on the line where we construct the ChatServiceClient proxy:

error CS1729: 'ChatClient.ChatService.ChatServiceClient' does not contain a constructor that takes 0 arguments

Because the service now has a duplex contract, the generated proxy insists that the client implement its half of the contract we need to provide an implementation of the callback interface and pass that to the proxy. Example 13-10 shows a straightforward implementation of the interface.

Note: Although you can create databases without using subtrees in OpenLDAP, doing so will mean that

bat file within the Solution Explorer and replace MyFeature with the name of your feature (in my case, ShareDocumentExample) Change the http://localhost to the site you want to use the workflow with After you save, then copy the folder to the server and run the bat file This installs the workflow DLL file in the GAC, and also performs the necessary associations and installs the feature Open the SharePoint site and click the Shared Documents link on the left Click Settings Document Library Settings Click Workflow Settings under the Permissions and Policies area If you haven t added a workflow before, you ll automatically come to the Add a Workflow form If you have workflows already defined in your SharePoint server, you ll need to click Add a Workflow first On the Add Workflow page, you ll see your workflow name at the top with other default workflows.

[CallbackBehavior(ConcurrencyMode=ConcurrencyMode.Reentrant)] class ChatCallback : IChatServiceCallback { public void NotePosted(string from, string note) { Console.WriteLine("{0}: {1}", from, note); } }