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full What if the class has been canceled or moved to a new date How can you determine if the trainer is available, is not on vacation, is not teaching a class that same week, or whatnot Depending on your current background, the process of gathering these requirements may be a very new task, as figuring out a business process may be someone else s problem. However, in small companies, the act of determining the necessary business processes may fall on the shoulders of the developers themselves. Larger organizations typically have business analysts who take on the role of discovering (and often modeling) the business processes. In any case, do be aware that working with WF is not simply a jump in and start coding endeavor. If you do not take the time to clearly analyze the business problem you are attempting to solve before coding, you will most certainly create a good amount of unnecessary pain. In this chapter, you will concentrate on the basic mechanics of workflow design, the use of activities, and how to work with the Visual Studio 2005 Orcas WF designers. However, don t be too surprised when your real-world workflows become substantially more complex.

From a programmer s point of view, WF is represented by three core assemblies: System.Workflow.Activities.dll: Defines the intrinsic activities and the rules that drive them System.Workflow.Runtime.dll: Defines types that represent the WF runtime engine and instances of your custom workflows System.Workflow.ComponentModel.dll: Defines numerous types that allow for design-time support of WF applications, including definitions for types used by the code-generation services of Visual Studio 2005 Orcas While these assemblies define a number of .NET namespaces, many of them are used behind the scenes by various WF visual design tools. Table 29-3 documents some WF-centric namespaces to be aware of. Table 29-3. Core WF Namespaces

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This is the core activity-centric namespace, which defines type definitions for each of the items on the Windows Workflow toolbox. Additional subnamespaces define the rules that drive these activities as well as types to configure them. This namespaces defines types that represent the WF runtime engine (such as WorkflowRuntime) and an instance of a given workflow (via WorkflowInstance). This namespace provides types to build a custom host for the WF runtime.

Table 7-2. Continued Debug Toolbar Button Command Locals Window Shortcut Key Description Displays the Locals window. The Locals window displays all of the variables in the current procedure and their values. Displays the Immediate window. The Immediate window allows you to type or paste code and press Enter to run it. Displays the Watch window. The Watch window is where you define expressions to be monitored (in the Watch window). Displays the Call Stack dialog box. The Call Stack dialog box lists procedures that have started but have not finished, in the order they were called.

Many display issues in IE/Win are the result of oddities in its rendering engine, specifically whether an element has layout, which is the source of much consternation among web standards developers (read all about IE s hasLayout property at www.satzansatz.de/cssd/onhavinglayout.html if you really want to know more). Elements behave quite differently when they have layout compared to when they do not, and usually the desired behavior results from a box having layout, which is triggered by applying any dimension to the box. Named after the incredibly intelligent woman who discovered it, Holly Bergevin (www.positioniseverything.net), the Holly hack builds on the Star HTML hack, using it to deliver a very small height to specified containers in IE, which tells IE s rendering engine to give the targeted element layout. Thanks to another bug in IE (which causes the browser to ignore a specified dimension and instead expand a box to contain its contents), this height is ignored and the box expands. Because IE/Mac does not suffer from the same float bug as its Windows counterparts but does process the Star HTML hack, a filter is used to hide the hack from that browser. The combination of the three parts Star HTML hack, the IE/Mac filter, and the Holly hack itself (the {height:1%;} declaration) looks like this: /* Hides from IE5-mac \*/ * html .floatcontainer { height:1%; } /* End hide from IE5-mac */ When fixing strange display behavior in IE/Win, this hack is often your best starting point for a quick solution (see the next section for an example of the Holly hack in use).

Be aware that when you create a new WF project template using Visual Studio 2005 Orcas, the IDE will reference each of the WF assemblies and update your namespace imports automatically.

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