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In this chapter, you ll consider three fundamental topics: How to use .NET data binding to show the information from any data object in any control. How to use the .NET data source model to query data a database without writing any code and whether you should rely on this approach in a serious application. How to design with data in mind, so you can keep your application ruthlessly organized and well encapsulated.

In the ASP.NET world, each validator inherits form a base class named BaseValidator. The BaseValidator class defines the basic features needed to connect to an input control and store an error message. This functionality is generic and can be reused in every validator. If you follow the same pattern, you ll have an easy time creating a wide range of custom validators. The BaseValidator needs a few basic ingredients: It needs to inherit from Component, so that it can be placed in the component tray. It needs to create an ErrorProvider behind the scenes for flagging invalid controls, and expose any ErrorProvider properties you should be able to change, like Icon. It needs to let you specify an error message. It needs to allow you to bind it to a specific control. When you do, it should automatically register itself to receive the Validating event for that control. It needs to respond to the Validating event, perform validation, and display the error icon if needed. Additionally, it needs to provide a Validate() method so you can trigger validation programmatically if needed, and it needs to expose an IsValid property so you can check what the validation outcome was. Keep in mind that the BaseValidator doesn t actually perform the validation, because it doesn t know what type of validation you want. Instead, it calls the EvaluateIsValid() method. The validator classes that inherit from BaseValidator override this method to implement the appropriate validation logic. In other words, the BaseValidator defines the infrastructure for binding to a control and performing validation, but the derived classes add the actual validation code. Figure 18-4 diagrams this interaction.

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The administrator can grant each code group a set of permissions (also called a PermissionSet). A typical PermissionSet, for example, specifies if the code group has access to the file system, registry, or Windows events log.

Figure 18-4. How the BaseValidator plugs in to a form The following code listings dissect the BaseValidator class piece by piece. First of all, the BaseValidator is defined as a MustInherit class, so that it can t be instantiated directly: Public MustInherit Class BaseValidator ... End Class Internally, the BaseValidator stores a private instance of an ErrorProvider, along with an error message and an IsValid property that reflects whether validation has failed. Here are the basic properties: ' Use an internal error provider to show error icons. Private errorProvider As New ErrorProvider() ' Expose whatever ErrorProvider settings you want the ' user to be able to modify (like Icon, BlinkStyle, and BlinkRate). ' This class exposes only Icon. Public Property Icon() As Icon Get Return errorProvider.Icon End Get Set(ByVal value As Icon) errorProvider.Icon = value End Set End Property

Generating the skybox textures may require a little more effort because each texture must seamlessly align with the four other textures it shares an edge with. If you are artistically inclined, you may be able to draw or paint these textures, but it is probably easier to use 3D modeling software to render six views of a scene for each face of the skybox. An excellent choice for rendering skyboxes is Terragen (www.planetside.co.uk/terragen/), which creates remarkably realistic-looking images of virtual landscapes. I used Terragen to create the skycube textures in Figure 12-3 that we will be using in the skybox sample code.

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