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For this illustrative example, simply rename the initial workflow file to SimpleExampleWorkflow.cs, and add a Code activity (named ShowMessageActivity) to the designer that maps to a method named ShowMessage(). This method displays a string literal within a Windows Forms message box (so be sure to reference the System.Windows.Forms.dll assembly in your project): private void ShowMessage(object sender, EventArgs e) { System.Windows.Forms.MessageBox.Show("Success!"); } Next, you ll add a single Delay activity, which allows you to inject a timed wait period within a given branch of a workflow. Using the Properties window, set the TimeoutDuration to 00:00:10,

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which equates to ten seconds. Finally, add a final Code activity (named ShowEndActivity) that maps to a method named ShowEndMessage, implemented as follows: private void ShowEndMessage(object sender, EventArgs e) { System.Windows.Forms.MessageBox.Show("Time up!"); } Figure 29-21 illustrates the example workflow.

The templates are used by hundreds of thousands of users around the world, using many different browsers and operating systems, so browser compatibility was essential. The layout Dan designed is fixed width, with pixel-precise widths for the columns (which are created using Dan Cederholm s excellent Faux Columns method; you can read the original article at www.alistapart.com/articles/fauxcolumns/; it s also covered in 7). The (X)HTML/ CSS was developed using the standards-first approach explained earlier, and the result (Figure 6-4) looked great in Firefox, Safari, and pretty much any browser that wasn t IE (typically, layouts developed using this method won t require much bug fixing at all, even in IE).

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Figure 29-21. The final (albeit very simple) workflow Now compile your code library to ensure you have not injected any typos.

Now that you have authored a reusable .NET code library that contains a custom workflow, you are able to build any sort of .NET application to make use of it. Add a new Windows Forms project (or, if you wish, a WPF project) to your current solution, and ensure you set this project as the start-up project through Solution Explorer. Next, add a reference to each of the following .NET assemblies: MyWorkflowLibrary.dll System.Workflow.Runtime.dll System.Workflow.Activities.dll System.Workflow.ComponentModel.dll

1. In the Download section for this book on the Apress web site, find the file named DebugExample01.xlsm and open it. This file contains sample sales data, but we ll ignore that for the time being. 2. Open the VBE by choosing the Visual Basic command from the Code tab of the Developer ribbon, or by pressing Alt+F11. 3. Open Standard Module1 by double-clicking its folder in the VBA Project window, as shown in Figure 7-4.

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Add a single Button type (named btnExecuteWorkflow) on the initial form, and handle the Click event. Within your code file, implement the button-click event handler to fire up the WF runtime engine and create an instance of your custom workflow. Notice that the following code is identical to that found within a console-based workflow application (minus the threading code required to keep the console program alive until the workflow completes): // Initial using statements removed for simplicity. // Need the WF runtime! using System.Workflow.Runtime; // Be sure to reference our custom WF library. using MyWorkflowLibrary; namespace WinFormsWFClient { public partial class MainForm : Form { public MainForm() { InitializeComponent(); } private void btnExecuteWorkflow_Click(object sender, EventArgs e) { // Create the WF runtime. WorkflowRuntime wfRuntime = new WorkflowRuntime(); // Get an instance of our WF. WorkflowInstance myWorkflow = wfRuntime.CreateWorkflow(typeof(SimpleExampleWorkflow)); // Start it up! myWorkflow.Start(); } } } Now, when you run your program and click the button, you should see the first message box display instantly, while the final dialog displays after approximately ten seconds. Given that this workflow is launching Windows Forms message boxes, it would not make good sense to use this particular WF code library within an ASP.NET web application, but the overall process is very similar. Look up the topic Developing ASP.NET Workflow Applications within the .NET Framework 3.0 documentation for further details.

Figure 6-4. Ooh, that design s so pretty I think I ll blog about my cats. However, when viewed in IE/Win, there was a slight problem with the sidebar display (Figure 6-5). When we say slight we mean OMG, the layout s ruined!

At this point, you have seen how to configure a handful of common WF activities (Code, While, InvokeWebService, etc.). While these built-in activities certainly are a firm starting point for many

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