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In this chapter, you looked at data binding expressions and the ASP.NET data source controls in detail. Along the way, you started using the GridView, ASP .NET s premier rich data control. In the next chapter, you ll explore the three most powerful data-bound controls in detail: the GridView, DetailsView, and FormView. You ll also learn how they work with a few data source features that this chapter didn t cover, such as sorting and filtering.

This chapter began by examining the issues associated with the classic containers found within the System.Collections namespace. While these types remain supported for purposes of backward compatibility, new .NET applications will benefit from using the generic counterparts within the System.Collections.Generic namespace instead. As you have seen, a generic item allows you to specify placeholders (type parameters) that you specify at the time of object creation (or invocation, in the case of generic methods). Essentially, generics provide a solution to the boxing and type-safety issues that plagued .NET 1.1 software development. Also, generic types largely remove the need to build custom collection types. While you will most often simply use the generic types provided in the .NET base class libraries, you will also able to create your own generic types (and generic methods). When you do so, you have the option of specifying any number of constraints (using the where keyword) to increase the level of type safety and ensure that you perform operations on types of a known quantity that are guaranteed to exhibit certain basic capabilities.

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The UserServiceImpl implementation will instantiate the UserDaoImpl class in the body of its constructor: public UserServiceImpl(){ userDao = new UserDaoImpl("users.xml"); } This way, you ensure that every time you create an instance of the UserServiceImpl class, you will create an instance of the UserDao data type. However, to keep the code scalable, you will create another constructor with a different signature that accepts as an argument a UserDao type object. That means you can create an instance of your UserServiceImpl by passing a userDao that uses a different XML file from the users.xml one, as follows: public UserServiceImpl(UserDao userDao){ setUserDao(userDao); }

Up to this point in the text, most of the applications you developed added various bits of code to Main(), which, in some way or another, sent requests to a given object. However, many applications require that an object be able to communicate back to the entity that created it using a callback mechanism. While callback mechanisms can be used in any application, they are especially critical for graphical user interfaces in that controls (such as a button) need to invoke external methods under the correct circumstances (when the button is clicked, when the mouse enters the button surface, and so forth). Under the .NET platform, the delegate type is the preferred means of defining and responding to callbacks within applications. Essentially, the .NET delegate type is a type-safe object that points to a method or a list of methods that can be invoked at a later time. Unlike a traditional C++ function pointer, however, .NET delegates are classes that have built-in support for multicasting and asynchronous method invocation. In this chapter, you will learn how to create and manipulate delegate types, then you ll investigate the C# event keyword, which streamlines the process of working with delegate types. Along the way, you will also examine several delegate- and event-centric language features of C#, including anonymous methods and method group conversions. I wrap up this chapter by examining lambda expressions. Using the C# lambda operator (=>), you can specify a block of code statements (and the parameters to pass to those code statements) wherever a strongly typed delegate is required. As you will see, a lambda expression is little more than an anonymous method in disguise, and provides a simplified approach to working with delegates.

n the previous chapter, you saw how to use the data source controls to perform queries, both with and without the assistance of a custom data access class. Along the way, you used some of ASP .NET s rich data controls, such as the GridView. However, you haven t delved into all the features these controls provide. In this chapter, you ll take a closer look at the GridView, DetailsView, and FormView and learn how to fine-tune formatting and take control of features such as selection, sorting, filtering, and templates. You ll also learn about advanced scenarios such as showing images, calculating summaries, and creating a master-details list in a single control.

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