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The Data Source Object Model
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You can use this feature so that a change in the database can invalidate related values in the cache. This is particularly helpful in Web farm scenarios when an update on a machine can automatically force a refresh on the data of all others.
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The new data binding model defined in ASP.NET 2.0 makes possible a codeless way to incorporate data into a Web application. This is made possible by data source controls that enable declaration and automatic instantiation of data components in a page. Two new interfaces IDataSource and IHierarchicalDataSource allow data sources and data-bound controls to work together silently and automatically. These interfaces offer a consistent model of data representation for both run-time and design-time operations. Does this mean that ASP.NET 2.0 offers a brand-new, exclusive data object model Not exactly. A key goal of ASP.NET 2.0 architects was to preserve the explicit data binding model of ASP.NET 1.x. This model enables developers to control exactly when and how data access is performed. The new architecture is more automatic in nature, but it works side by side with the old model. Finally, many ASP.NET 1.x developers complained that only the main ADO.NET objects DataSet, DataTable, and DataView could easily be bound to data controls. XML documents and collections of objects needed extra work to be bound to high-end controls such as DataGrid. The introduction of data source controls in ASP.NET 2.0 also enables a consistent model across a variety of data sources. The page developer can use the same data binding model regardless of whether the data source is a SQL table, an XML document, a business object, a site map, or even an Excel worksheet. In the next chapter, we ll look at the new family of data-bound controls that were designed to take advantage of codeless data binding.
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Data-Bound Controls
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Data binding was one of the most pleasant surprises in ASP.NET 1.x. It was far simpler and more effective than the support for data access in Microsoft Active Server Pages (ASP). But it turned out to have some shortcomings not in terms of overall functionality but because you had to write a lot of custom code to handle necessary operations such as paging, sorting, editing, and deleting data. As you saw in 6, the new data source model in ASP.NET 2.0 largely removes these difficulties. The new data source model works with ASP.NET 2.0 specific controls and also enhances the existing data-bound controls with extra features such as codeless data binding. The DataGrid is the principal control of most data-driven ASP.NET 1.x applications. It generates a tabular representation of data and offers advanced functionality such as paging, sorting, and in-place editing. Like all ASP.NET 1.x controls, the DataGrid is fully supported in ASP.NET 2.0 but is partnered with a newer control that is meant to replace it in the long run. The new grid control, GridView, is complemented by other view controls, such as DetailsView and FormView. In this chapter, we ll look at the revised architecture of data-bound controls in ASP.NET 2.0 and examine the most important new data-bound controls GridView, FormView, and DetailsView.
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Hierarchy of Data-Bound Controls
A data-bound control is a control that is bound to a data source and generates its user interface by enumerating the items in the data source. Data-bound controls range from simple list controls (such as DropDownList and ListBox) that
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Part II
Data Access
use the data to flesh out the markup, to more complex controls (such as DataList and DataGrid) that use the bound data to create their own hierarchy of child controls. In ASP.NET 1.x, the class diagram for data-bound controls is basically made up of three main branches of controls, as shown in Figure 7-1.
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