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So far, the examples have used the GridView control to show data using separate bound columns for each field. If you want to place multiple values in the same cell, or you have the unlimited ability to customize the content in a cell by adding HTML tags and server controls, you need to use a TemplateField. The TemplateField allows you to define a completely customized template for a column. Inside the template you can add control tags, arbitrary HTML elements, and data binding expressions. You have complete freedom to arrange everything the way you want. For example, imagine you want to create a column that combines the in stock, on order, and reorder level information for a product. To accomplish this trick, you can construct an ItemTemplate like this: <asp:TemplateField HeaderText="Status"> <ItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /> <b>Reorder:</b> <%# Eval("ReorderLevel") %> </ItemTemplate> </asp:TemplateField>

Wouldn t it be nice to have a delegate that could refer to more than one function at once and invoke them simultaneously This would allow the client application to have multiple listeners and notify the listeners all at once when something happens. In fact, delegates do have this functionality, but you re more likely to see it in use with .NET events. Events, which are described in the next chapter, are based on delegates but work at a slightly higher level. In a typical ASP.NET program, you ll use events extensively, but you ll probably never work directly with delegates.

Tip Linux and Mac users will already have a compatible font, but Windows users can find one on http://

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It s impossible to do justice to an entire language in a single chapter. However, if you ve programmed before, you ll find that this chapter provides all the information you need to get started with the C# language. As you work through the full ASP.NET examples in the following chapters, you can refer to this chapter to clear up any language issues. In the next chapter, you ll learn about more important language concepts and the object-oriented nature of .NET.

Note Your template only has access to the fields that are in the bound data object. So if you want to show

.NET is thoroughly object-oriented. Not only does .NET allow you to use objects, but it demands it. Almost every ingredient you ll need to use to create a web application is, on some level, really a kind of object. So, how much do you need to know about object-oriented programming to write .NET pages It depends on whether you want to follow existing examples and cut and paste code samples or have a deeper understanding of the way .NET works and gain more control. This book assumes that if you re willing to pick up a thousand-page book, then you re the type of programmer who excels by understanding how and why things work the way they do. It also assumes you re interested in some of the advanced ASP.NET programming tasks that will require class-based design, such as creating your own database component (see 22). This chapter explains objects from the point of view of the .NET Framework. It doesn t rehash the typical object-oriented theory, because countless excellent programming books cover the subject. Instead, you ll see the types of objects .NET allows, how they re constructed, and how they fit into the larger framework of namespaces and assemblies.

the UnitsInStock, UnitsOnOrder, and ReorderLevel fields, you need to make sure the SqlDataSource query returns this information.

As a developer you ve probably already created classes or at least heard about them. Classes are the code definitions for objects. The nice thing about a class is that you can use it to create as many objects as you need. For example, you might have a class that represents an XML file, which can be used to read some data. If you want to access multiple XML files at once, you can create several instances of your class, as shown in Figure 3-1. These instances are called objects.

To create the data binding expressions, the template uses the Eval() method, which is a shared method of the System.Web.UI.DataBinder class. Eval() is an indispensable convenience it automatically retrieves the data item that s bound to the current row, uses reflection to find the matching field, and retrieves the value.

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