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Data objects are used in a variety of ways. In this book, the term refers to a custom object you make that represents a certain grouping of data. For example, you could create a Person class that has properties such as Height, Age, and EyeColor. Your code can then create data objects based on this class. You might want to use a data object to pass information from one portion of code to another. (Note that data objects are sometimes used to describe objects that handle data management. This isn t the way you ll see me use them in this book.)

This is yet another search strategy that doesn t provide the best search results, but it s worth taking a look at. This is the search method used in the Community Starter Kit (CSK).

The term business object often means different things to different people. Generally, business objects are the components in the second level of your application that provide the extra layer between your code and the data source. They are called business objects because they enforce business rules. For example, if you try to submit a purchase order without any items, the appropriate business object will throw an exception and refuse to continue. In this case, no .NET error has occurred instead, you ve detected the presence of a condition that shouldn t be allowed according to your application s logic.

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You ve used an earlier example as the basis for this example, and you ve simply added a label to the page that you populate with the count of the number of Players for the selected Manufacturer. The count is returned by using the following COUNT(*) scalar function and returning this as the result from a SELECT query: SELECT COUNT(*) FROM Player WHERE @ManufacturerID = 0 OR Player.PlayerManufacturerID = @ManufacturerID You re filtering the results using a parameter, and by specifying COUNT(*) as the only column, the query will return a single row containing a single column. This is how you use the ExecuteScalar() method. The ExecuteScalar() method returns an object representing the value that has been returned from the query. In this case, you re returning an integer, and you need to convert this to a string before you can assign it to the Text property of the label, like so: lblCount.Text = Convert.ToString(myCommandCount.ExecuteScalar());

In this chapter s examples, business objects are also going to contain data access code. In an extremely complicated, large, and changeable system, you might want to further subdivide components and actually have your user interface code talking to a business object, which in turn talks to another set of objects that interact with the data source. However, for most programmers, this extra step is overkill, especially with the increased level of sophistication ADO.NET provides.

Technically, a component is just a collection of one or more classes (and possibly other .NET types, such as structures and enumerations) that are compiled together as a unit. For example, Microsoft s System.Web.dll is a single (but very large) component that provides the types found in many of the System.Web namespaces. So far, the code examples in this book have used only a few kinds of classes mainly custom web page classes that inherit from System.Web.UI.Page and contain mostly event handling procedures. Component classes, on the other hand, usually won t include any user interface logic (which would limit their use unnecessarily) and don t need to inherit from an existing class. They are more similar to the custom web service classes described in Part 4 of this book, which collect related features together in a series of utility methods.

Note The CSK is a complex, free, and customizable application (provided with full source code) from

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