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One of the many workflows that needs to be implemented might need to have values passed into it. This might include needing to know the user name of a user, or to know a document name that is to be approved or not approved. The workflow can accept input parameters, which are defined within the workflow file as public write-only properties, or the workflow can provide back output parameters that are defined within the workflow file as read-only properties. The first step is to define the parameters that you want passed to the workflow as public write-only properties. Add two private integer variables to the Workflow1 class, one called InputValue1, and one called InputValue2. Define two public write-only properties, one called Input1 and the other called Input2. Then define the output parameter by defining a private integer called OutputResult, and a public read-only property called OutputValue. Here s the resulting code: Private InputValue1 As Integer Private InputValue2 As Integer Private OutputResult As Integer Public WriteOnly Property Input1() As Integer Set(ByVal value As Integer) InputValue1 = value End Set End Property Public WriteOnly Property Input2() As Integer Set(ByVal value As Integer) InputValue2 = value End Set End Property Public ReadOnly Property OutputValue() As Integer Get Return OutputResult End Get End Property Next, add OutputResult = InputValue1 + InputValue2 to the Step1_ExecuteCode sub before the message box: Private Sub Step1_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) OutputResult = InputValue1 + InputValue2 MsgBox("Step1") End Sub This line of code adds the local variables for the input parameters together and assigns the result to the local variable for the output parameter. Open the Module1.vb file and add a new

The named.conf configuration file in Listing 11-8 is almost the same as the rndc.conf file, except that it is designed for the named domain name server. It also follows the syntax of the rndc.conf file when specifying directives.

TaskScheduler uiScheduler = TaskScheduler.FromCurrentSynchronizationContext(); Task<IPHostEntry>.Factory.FromAsync( Dns.BeginGetHostEntry, Dns.EndGetHostEntry, "oreilly.com", null) .ContinueWith((task) => UpdateUi(task.Result.AddressList[0].ToString()), uiScheduler);

arguments, which covers the vast majority of APM implementations. As well as passing the Begin and End methods, we also pass the arguments, and the additional object argument that all APM Begin methods accept. (For the minority of APM implementations that either require more arguments or have out or ref parameters, there s an overload of FromAsync that accepts an IAsyncResult instead. This requires slightly more code, but enables you to wrap any APM implementation as a task.) We ve seen the main ways to create tasks, and to set up associations between them either with parent-child relationships or through continuations. But what happens if you want to stop some work after you ve started it Neither the thread pool nor the APM supports cancellation, but the TPL does.

Cancellation of asynchronous operations is surprisingly tricky. There are lots of awkward race conditions to contend with. The operation you re trying to cancel might already have finished by the time you try to cancel it. Or if it hasn t it might have gotten beyond the point where it is able to stop, in which case cancellation is doomed to fail. Or work might have failed, or be about to fail when you cancel it. And even when cancellation is possible, it might take awhile to do. Handling and testing every possible combination is difficult enough when you have just one operation, but if you have multiple related tasks, it gets a whole lot harder.

The file also contains two directives, key and control. The key directive behaves the same as the one in rndc.conf and has the same value. This key is used by named to validate clients using rndc to connect to it. If the rndc client has the same key value as the named server, the former can administer the latter. The controls directive is used by named to determine how to handle rndc clients trying to connect to it. The controls directive allows rndc connections made to the name server locally, and the client should use the "rndckey" value for a successful connection. This file will contain additional directives later as you learn more about the different types of name servers that you can use. With the two configuration files, we can now start creating our DNS servers using named.

Fortunately, .NET 4 introduces a new cancellation model that provides a well thought out and thoroughly tested solution to the common cancellation problems. This cancellation model is not limited to the TPL you are free to use it on its own, and it also crops up in other parts of the .NET Framework. (The data parallelism classes we ll be looking at later can use it, for example.) If you want to be able to cancel an operation, you must pass it a CancellationToken. A cancellation token allows the operation to discover whether the operation has been canceled it provides an IsCancellationRequested property and it s also possible to pass a delegate to its Register method in order to be called back if cancellation happens.

requested. It does not provide the ability to initiate cancellation. That is provided by a separate class called CancellationTokenSource. The reason for splitting the discovery and control of cancellation across two types is that it would otherwise be impossible to provide a task with cancellation notifications without also granting that task the capability of initiating cancellation. CancellationTokenSource is a factory of cancellation tokens you ask it for a token and then pass that into the operation you want to be able to cancel. Example 16-23 is similar to Example 16-21, but it passes a cancellation token to StartNew, and then uses the source to cancel the operation if the user clicks a Cancel button.