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Creating custom controls is a complex, detailed topic that s well-suited to a chapter of its own. ASP.NET 2.0 keeps the underlying control creation model from ASP.NET 1.x, but adds a number of important refinements. They include the following: Control adapters: ASP.NET 1.x makes a distinction between up-level and down-level clients. However, it s up to you to implement adaptive rendering by checking the properties of the current browser and writing conditional rendering code. In ASP.NET 2.0, a new model adds to the existing control model adaptive rendering. Using this model, you can create an adapter that customizes a single control for a single type of browser, potentially allowing you to support different devices without rewriting your web forms. Control state: In ASP.NET 1.x, controls stored all their information in view state, which could be disabled through the EnableViewState property. ASP.NET 2.0 adds control state, a protected section of view state that can t ever be disabled. Composite controls: These controls, which wrap a combination of existing server controls in a higher-level abstraction, were fairly easy to create in ASP.NET 1.x. In ASP.NET 2.0 they get even easier with a new CompositeControl base class. Client callbacks: Rather than posting back the entire page, your custom control can send a request to the server to get just the additional information it needs. Client callbacks aren t discussed in this chapter instead, you ll learn how to use them in 29. The design-time support for controls also has a number of enhancements. You ll learn about these in the next chapter.

Note In addition to WorkflowInvoker and WorkflowApplication, you can also start and monitor a workflow instance using WorkflowServiceHost. This class supports features like messaging activities, multi-instancing, and configuration. If your workflow-enabled WCF service is under IIS, WorkflowServiceHost is used automatically.

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Server controls are .NET classes that derive from System.Web.UI.WebControls.WebControl (which itself derives from Control) or System.Web.UI.Control. The Control class provides properties and methods that are common across all server controls (such as ID, ViewState, and the Controls collection). The WebControl class adds a few features that help you implement standard styles. These include properties such as Font, ForeColor, and BackColor. Ideally, you ll create your server controls in a separate class library project and compile the project into a separate DLL assembly. Although you can create a custom control and place the source code directly in the App_Code directory, this limits your ability to reuse the control in pages written in different languages. If you place controls in a separate assembly, you ll also have better design-time support when you use them in pages. To get a better idea of how custom controls work, the following sections demonstrate a couple of simple examples.

That wraps up your first look at WF 4.0. While this example was very trivial, you did learn a few interesting (and useful) tasks. First, you learned that you can pass in a Dictionary object which contains name/value pairs that will be passed to identically named arguments in your workflow. This is really useful when you need to gather user input (such as a customer ID number, SSN, name of a Doctor, etc) which will be used by the workflow to process its activities. You also learned that a .NET 4.0 workflow is defined in a declarative manner (by default) using an XML-based grammar named XAML. Using XAML, you can specify which activities your workflow contains. At runtime, this data will be used to create the correct in-memory object model. Last but not least, you looked at two different approaches to kick off a workflow using the WorkflowInvoker and WorkflowApplicaion classes.

To create a basic custom control, you need to derive from the Control class and override the Render() method. The Render() method provides an HtmlTextWriter object that you use to generate the HTML for the control. The simplest approach is to call HtmlTextWriter.Write() to write a string of raw HTML to the page. (ASP.NET tags and other server-side content obviously won t work here.) Here s an example control that generates a simple hyperlink using the HtmlTextWriter in the Render() method: Public Class LinkControl Inherits Control Protected Overrides Sub Render(ByVal output As HtmlTextWriter) output.Write("<a href='http://www.apress.com'>Click to visit Apress</a>") End Sub End Class The HtmlTextWriter class not only lets you write raw HTML but it also provides some helpful methods to help you manage style attributes and tags. Table 27-1 describes the key methods. Table 27-1. HtmlTextWriter Methods

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