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To make it easier to use your custom control, you probably want to allow it to appear in the Toolbox. Impressively, Visual Studio 2005 has built-in Toolbox support for custom controls, provided you create them in a separate assembly. To try this, add a Web Control project to your website solution by choosing File Add New Project. (Alternatively, you can add a class library project the only difference is that you ll need to add the assembly references and namespace imports needed for web development.

Remember, Visual Studio supports projectless development, which means it hides solution files away in a user-specific directory. This means that it s fairly easy to lose the solution file (for example, by moving the website to another computer or renaming the website directory outside of Visual Studio). If you take this step, you won t cause an error, but the next time you load your website, the custom control project won t be appear in the design environment instead, you ll need to use Add Existing Project to get it back.

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Once you ve created your project, you can define your controls. You develop your control library project in the same way you work with any other DLL component. You can build the project at any time, but you can t start it directly because it isn t an actual application. To test your controls, you need to use them in another application. You can use two approaches. First, you can add a reference in the same way that you add a reference to any other .NET assembly. Just right-click your website in the Solution Explorer, and choose Add Reference. Choose the Project tab, pick the custom control project you ve created, and click OK. This copies the compiled control assembly to your Bin directory, making it available to your pages. An easier approach is to use the new automatic Toolbox support in Visual Studio 2005. When you compile a project that contains custom server controls, Visual Studio examines each control and adds it dynamically to a temporary, project-specific section of the Toolbox at the top (see Figure 27-2). That means you can easily add controls to any page. When you drop the control on the page, Visual Studio automatically copies the assembly over to the Bin directory if you haven t already created a reference, adds the Register directive if it s not already present in the page, and then adds the control tag.

As with any other type of reference in Visual Studio, every time you compile your project, the most recent version of the referenced assembly is copied into your web application s Bin directory. This means that if you change and recompile a custom control after adding it to the Toolbox, you have no reason to remove and re-add it.

vari-

The challenges of provider-agnostic aren t completely solved yet. Even with the provider factories, you still face a few problems. For example, there s no generic way to catch database exception objects (because different provider-specific exception objects don t inherit from a common base class). Also, different providers may have slightly different conventions with parameter names and may support specialized features that aren t available through the common base classes (in which case you need to write some thorny conditional logic).

Summary

In this chapter, you learned about the first level of database access with ADO.NET: connected access. In many cases, using simple commands and quick read-only cursors to retrieve results provides the easiest and most efficient way to write data access code for a web application. Along the way, you considered some advanced topics, including SQL injection attacks, transactions, and provider-agnostic code. In the next chapter, you ll learn how to use these techniques to build your own data access classes and how to use ADO.NET s disconnected DataSet.

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