There’s a good reason that this book covered ADO.NET before dealing with simpler data access techniques, such as writing and reading ordinary files. Traditional file access is generally much less useful in a web application than it is in a desktop program. Databases, on the other hand, are designed from the ground up to support a large number of simultaneous users with speed, safety, and efficiency. Most web applications will rely on a database for some features, but many won’t have any reason to use direct file access.
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