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One common need among larger companies is surveillance of the company s data. It s important to know who is making changes; if anything goes wrong, there s someone who can be held accountable. This is also useful for smaller businesses, but the need is less urgent with fewer employees who have access to the data in question. Nearly any organization of any size can benefit from knowing who last changed a model instance, but it s often left to those other guys who really need it. It doesn t have to be that way. Combining a few of the tools available in Django, recording the user who last made changes to a model instance doesn t have to be a difficult task. On the surface, it seems ridiculously simple. A standard way to override what values get saved for a field is to override the model s method and set the value there. 10 showed how this can be used to calculate one field s value based on the values of other fields. It seems reasonable that this same technique could be used to insert the current user into a field.

ach type of custom control has its own advantages and disadvantages. In 14, you learned about user controls. User controls are easier to create than custom server controls, but server controls are far more powerful. Server controls beat user controls in two key areas: Server controls give you complete control over the HTML you generate: In other words, you can create a control such as the ASP.NET Calendar, which provides a single object interface but renders itself as a complex combination of elements. Server controls provide better design-time support: You can add them to the Toolbox in Visual Studio and set properties and add event handlers at design time. You can even configure the description that Visual Studio will show for each property, along with other design-time niceties. All of ASP.NET s web controls are server controls. In this chapter, you ll learn how you can build your own.

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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.

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.

There s just one problem: where does come from Django s models are separated from views, so the request isn t just magically available inside a model method. One possible solution is to pass the user in manually. After all, the request isn t what s really important; it s the user we re after.

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