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A Consistent Model for Heterogeneous Data Sources
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Not only are data source components designed to connect to data providers in a codeless way, but they also support a variety of sources using a single model.
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The Data Source Object Model
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Supported data source types include relational databases, XML documents, and custom business objects. ASP.NET 2.0 data-bound controls work with any of these data sources. Microsoft provides a few built-in data sources, but you can define others.
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Defining a Standard Set of Data Operations
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A data source component is a data control that can implement some or all of a standard set of data operations. Whether a control implements the entire standard set of operations or only a subset depends on the class. For example, you can have a SQL data source control (a data source control that manages relational data) that supports selection and updates and another data source control that provides only selection capabilities. The standard set of data operations includes the four basic I/O operations: select, delete, insert, and update. The data source component is also expected to return the fetched data as an object. The type of the returned object depends on the particular implementation. The selection should be smart enough to support optional filtering and sorting. The data source component exposes these operations to page developers through a number of intuitive method calls on the data source control. The methods are grouped in a new interface that characterizes the data source components.
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The data source object model is not a new API alternative to ADO.NET or OLE DB. Data source components form a layer of code that works between databound controls (and data-driven classes) and the low-level API used to retrieve data. This low-level API can be ADO.NET, System.Xml, or perhaps Microsoft Indexing Service or Excel s COM object model, depending on the data being exposed. A data source component implements a number of tailor-made interfaces to communicate with clients mostly data-bound controls. In ASP.NET 2.0, data-bound controls have been extended to support a new set of interfaces so they can take their data out of data source components no matter what the real underlying data source is. The binding model was primarily based on the IEnumerable interface in ASP.NET 1.x; it is also based on other, richer interfaces in ASP.NET 2.0 that are representative of data source controls. One difference between data source components and ASP.NET 1.x bindable classes is that the new data source object model allows you to select, insert, delete, and update data stored in a bound source be it a relational database, an XML file, or an Excel document.
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Part II
Data Access
A Richer Design-Time Experience
Data source components were introduced in ASP.NET 2.0 for two main reasons. The first was to simplify the programming model with a set of advanced controls (sort of programmatic wizards) that could perform I/O operations on generic blocks of data. In this respect, I consider data source components as the evolution of the ADO.NET 1.x data access application block a set of time-saving classes that can speed up development. As for the second reason, consider that in ASP.NET 1.x, knowledge of page life cycle events is required for building data access layers. Similarly, familiarity with ADO.NET objects and best practices is highly recommended. In ASP.NET 2.0, all common data access scenarios (i.e., stateless scenarios) can be implemented with zero lines of code. The availability of such powerful controls also makes design-time page composition simpler and more effective. Designers can work with realistic (if not real) data at design time. In addition, the schema of the data is known, so a data-bound control can give its user interface a reasonable appearance. This helps developers to more quickly customize the appearance and layout of the data that will be shown in the control. As a result, the design-time user experience is richer and more pleasant.
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