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here 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. Of course, enterprising ASP.NET developers can find a use for almost any technology. If this book didn t cover file access, no doubt many developers would be frustrated when designing web applications with legitimate (and innovative) uses for ordinary files. In fact, file access is so easy and straightforward in .NET that it may be perfect for simple, small-scale solutions that don t need a full-fledged database product like SQL Server. This chapter explains how you can use the classes in .NET to read and change file system information and even build a simple file browser. You ll also learn how to create simple text and binary files of your own. Finally, you ll consider how you can allow users to upload their own files to your web server.

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.NET includes functionality for turbo-charging your file writing and reading. This functionality comes from several static methods in the File class that let you read or write an entire file in a single line of code. For example, here s a quick code snippet that writes a three-line file and then retrieves it into a single string: string[] lines = new string[]{"This is the first line of the file.", "This is the second line of the file.", "This is the third line of the file."}; // Write the file in one shot. File.WriteAllLines(@"c:\testfile.txt", lines); // Read the file in one shot (into a variable named content). string content = File.ReadAllLines(@"c:\testfile.txt"); Table 17-8 describes the full set of quick file access methods. All of these are static methods.

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Why is it that most web applications don t use files There are several limitations to files: File-naming limitations: When you create a new file, it obviously can t have the same name as an existing file in the same directory. That means you ll probably need to fall back on some system for randomly generating files names. For example, you might create a file name based on a random number combined with the current date and time, or create a file name that incorporates a GUID (globally unique identifier). With both of these approaches, file names would be statistically unique, which means duplicates would be extremely unlikely. However, the file names wouldn t be very meaningful. In databases, this problem is solved more neatly with the auto-increment data type, which automatically fills a specific field with a unique number when you create a record. Multiuser limitations: Relational databases provide features like locking and transactions to prevent inconsistencies and make sure multiple people can use the same data at the same time. Comparatively, the web server s file system is woefully backward. Although you can allow multiple users to read a file at once, it s almost impossible to let multiple users update the same file at the same time without catastrophe.

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ReadAllText() ReadAllLines()

Scalability problems: File operations suffer from some overhead. In a simple scenario, file access may be faster than connecting to a database and performing a query. But the cumulative effect in a large web application is very different. When multiple users are working with files at the same time, your web server may slow down dramatically. Security risks: If you allow the user to specify a file or path name, the user could devise a way to trick your application into accessing or overwriting a protected system file. Even without this ability, a malicious or careless user might use an ASP.NET page that creates or uploads files to fill up your web server hard drive and cause it to stop working. All of these problems are preventable, but they require a bit more work than a database-backed solution. Of course, file access does have its uses. Maybe you need to access information that another application has stored in a file. Or maybe you need to store your information in a file so that other applications can access it. For example, you might be creating an intranet application that allows a small set of trusted employees to upload and manage documents. You could store their documents in a binary field in a database table, but that would make it more difficult to browse and open those files without using your web front end. In these situations, you ll be happy to know that ASP.NET can use all the file access features of the .NET Framework. That means your web applications can freely explore the file system, manage files, and create new files with custom content.

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