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Moving from ADO to ADO.NET
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ADO is a collection of ActiveX objects that are designed to work in a constantly connected environment. It was built on top of OLE DB (which we ll look at in the Working with the OLE DB Data Provider section). OLE DB provides access to non-SQL data as well as SQL databases, and ADO provides an interface designed to make it easier to work with OLE DB providers. However, accessing data with ADO (and OLE DB under the hood) means you have to go through several layers of connectivity before you reach the data source. Just as OLE DB is there to connect to a large number of data sources, an older data access technology, Open Database Connectivity (ODBC), is still there to connect to even older data sources such as dBASE and
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CHAPTER 9 s GETTING TO KNOW ADO.NET
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Paradox. To access ODBC data sources using ADO, you use an OLE DB provider for ODBC (since ADO only works directly with OLE DB), thus adding more layers to an already multilayered model. With the multilayered data access model and the connected nature of ADO, you could easily end up sapping server resources and creating a performance bottleneck. ADO served well in its time, but ADO.NET has some great features that make it a far superior data access technology.
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ADO.NET Isn t a New Version of ADO
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ADO.NET is a completely new data access technology, with a new design that was built entirely from scratch. Let s first get this cleared up: ADO.NET doesn t stand for ActiveX Data Objects .NET. Why For many reasons, but the following are the two most important ones: ADO.NET is an integral part of .NET, not an external entity. ADO.NET isn t a collection of ActiveX components. The name ADO.NET is analogous to ADO because Microsoft wanted developers to feel at home using ADO.NET and didn t want them to think they d need to learn it all over again, as mentioned earlier, so it purposely named and designed ADO.NET to offer similar features implemented in a different way. During the design of .NET, Microsoft realized that ADO wasn t going to fit in. ADO was available as an external package based on Component Object Model (COM) objects, requiring .NET applications to explicitly include a reference to it. In contrast, .NET applications are designed to share a single model, where all libraries are integrated into a single framework, organized into logical namespaces, and declared public to any application that wants to use them. It was wisely decided that the .NET data access technology should comply with the .NET architectural model. So, ADO.NET was born. ADO.NET is designed to accommodate both connected and disconnected access. Also, ADO.NET embraces the fundamentally important XML standard, much more than ADO did, since the explosion in XML use came about after ADO was developed. With ADO.NET, not only can you use XML to transfer data between applications, but you can also export data from your application into an XML file, store it locally on your system, and retrieve it later when you need it. Performance usually comes at a price, but in the case of ADO.NET, the price is definitely reasonable. Unlike ADO, ADO.NET doesn t transparently wrap OLE DB providers; instead, it uses managed data providers that are designed specifically for each type of data source, thus leveraging their true power and adding to overall application speed and performance. ADO.NET also works in both connected and disconnected environments. You can connect to a database, remain connected while simply reading data, and then close your connection, which is a process similar to ADO. Where ADO.NET really begins to shine is in the disconnected world. If you need to edit database data, maintaining a continuous connection would be costly on the server. ADO.NET gets around this by providing a sophisticated disconnected model. Data is sent from the server and cached locally on the client. When you re ready to update the database, you can send the changed data back to the server, where updates and conflicts are managed for you.
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