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The DataGrid is still available in ASP.NET 2.0, and it now supports binding to a data source control. Although you can t find it in the Toolbox, you can add it by right-clicking the Toolbox and selecting Choose Items. As a rule of thumb, the DataGrid should be used only for backward compatibility and existing ASP.NET websites (where it still works quite well). When creating a new website, use the GridView instead.

In 10, you will see how to use the Spring IoC container to inject all of your beans and let them be managed by the container. Using Spring, you can inject the UserDao to the container and then refer its instance to UserServiceImpl or other beans. Listings 9-16 and 9-17 show the code for the interface and its implementation for the service layer.

Note We will examine the asynchronous behavior of delegate types during our investigation of the System.Threading namespace in 19.

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The GridView examples you ve seen so far have set the GridView.AutoGenerateColumns property to True. When this property is set, the GridView uses reflection to examine that data object and finds all the fields (of a record) or properties (of a custom object). It then creates a column for each one, in the order that it finds it. This automatic column generation is good for creating quick test pages, but it doesn t give you the flexibility you ll usually want. For example, what if you want to hide columns, change their order, or configure some aspect of their display, such as the formatting or heading text In all of these cases, you ll need to set AutoGenerateColumns to False and define the columns yourself in the <Columns> section of the GridView control tag.

Defining a Delegate Type in C#

It s possible to have AutoGenerateColumns set to True and define columns in the <Columns> section. In this case, the columns you explicitly defined are added before the autogenerated columns. This technique was used in the previous chapter to create a GridView with automatically generated bound columns and a manually defined column with edit controls. However, for the most flexibility you ll usually want to explicitly define every column.

When you want to create a delegate type in C#, you use the delegate keyword. The name of your delegate type can be whatever you desire. However, you must define the delegate to match the signature of the method(s) it will point to. For example, assume you wish to build a delegate type named BinaryOp that can point to any method that returns an integer and takes two integers as input parameters: // This delegate can point to any method, // taking two integers and returning an integer. public delegate int BinaryOp(int x, int y); When the C# compiler processes delegate types, it automatically generates a sealed class deriving from System.MulticastDelegate. This class (in conjunction with its base class, System.Delegate) provides the necessary infrastructure for the delegate to hold onto a list of methods to be invoked at a later time. For example, if you examine the BinaryOp delegate using ildasm.exe, you would find the class shown in Figure 11-1. As you can see, the compiler-generated BinaryOp class defines three public methods. Invoke() is perhaps the key method, as it is used to invoke each method maintained by the delegate object in a synchronous manner, meaning the caller must wait for the call to complete before continuing on its way. Strangely enough, the synchronous Invoke() method need not be called explicitly from your C# code. As you will see in just a bit, Invoke()is called behind the scenes when you make use of the appropriate C# syntax.

Each column can be any of several different types, as described in Table 10-1. The order of your column tags determines the right-to-left order of columns in the GridView. Table 10-1. Column Types

BeginInvoke() and EndInvoke() provide the ability to call the current method asynchronously on a separate thread of execution. If you have a background in multithreading, you know that one of the most common reasons developers create secondary threads of execution is to invoke methods that require time to complete. Although the .NET base class libraries supply an entire namespace devoted to multithreaded programming (System.Threading), delegates provide this functionality out of the box.

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