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To read the information, you use the corresponding StreamReader class. It provides a ReadLine() method that gets the next available value and returns it as a string. ReadLine() starts at the first line and advances the position to the end of the file, one line at a time. StreamReader r = File.OpenText(@"c:\myfile.txt"); string inputString; inputString = r.ReadLine(); // = "This file generated by ASP.NET" inputString = r.ReadLine(); // = "42" ReadLine() returns a null reference when there is no more data in the file. This means you can read all the data in a file using code like this: // Read and display the lines from the file until the end // of the file is reached. string line; do { line = r.ReadLine(); if (line != null) { // (Process the line here.) } } while (line != null); As when writing to a file, you must close the file once you re finished: r.Close(); The code you ve seen so far opens a file in single-user mode. If a second user tries to access the same file at the same time, an exception will occur. You can reduce this problem when opening files using the more generic four-parameter version of the File.Open() method instead of File.OpenText(). You must specify FileShare.Read for the final parameter. Unlike the OpenText() method, the Open() method returns a FileStream object, and you must manually create a StreamReader that wraps it. Here s the code you need to create a multiuser-friendly StreamReader: FileStream fs = File.Open(@"c:\myfile.txt", FileMode.Open, FileAccess.Read, FileShare.Read); StreamReader r = new StreamReader(fs);

his appendix summarizes the basic syntax for SELECT, INSERT, UPDATE, and DELETE queries. This isn t intended as a full reference, but as a recap of how to use the queries in ASP.NET, as demonstrated in the examples in this book. In this appendix, the SQL keywords are shown in all uppercase letters. Optional elements of a query are surrounded by brackets. User-defined elements of a query are in italics. Note that SQL keywords don t need to be in uppercase, and the queries don t need to be separated over many lines, as they are shown in this appendix. These conventions just make it easier to read and understand them. SQL is case-insensitive, except for cases where the database server insists that table and column names are case-sensitive, which depends on how your database server is configured. If you ve followed the installation instructions in Appendix A, then both SQL Server 2005 and MySQL 5.0 are case-insensitive. However, you should endeavor to be consistent in your letter casing, because it will reduce the chances of problems cropping up later. You can find Microsoft s Transact-SQL reference online at http://msdn.microsoft.com/ en-us/library/ms189826.aspx. You can find MySQL s SQL reference online at http://dev. mysql.com/doc/refman/5.0/en/sql-syntax.html. Each section in this appendix includes links relevant to the specific query from these references.

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prevents Profile from using a database transaction to save the data. We want to prevent this because DatabaseObject has already initiated a transaction, so the saving of profile data falls within this transaction. In other words, if we were to return false from postUpdate(), the transaction would be rolled back, meaning the changes to the user table wouldn t be saved, and the profile data would remain unchanged in the database.

disk as a simple text file. This is a common technique for storing information in a web application, but it s quite a bit different from the file access code you ve seen in this chapter. Cookies are created on the client side rather than on the server. This means your ASP.NET code may be able to use them on subsequent requests from the same user, but they aren t suitable when storing information you need to review later, information that s more permanent, or information that affects more than one user.

Tip Two good books on SQL in general are The Programmer s Guide to SQL by Cristian Darie and Karlie Watson (1-59059-218-2; Apress, 2003) and Teach Yourself SQL in 10 Minutes by Ben Forta (0-67232-567-5; Sams, 2004). Both are good introductory guides to the subtleties of SQL not covered here.

You can also read and write to binary files Binary data uses space more efficiently but also creates files that aren t human-readable If you open a file in Notepad, you ll see a lot of extended ASCII characters (politely known as gibberish) To open a file for binary writing, you need to create a new BinaryWriter object The constructor accepts a stream, which you can retrieve using the FileOpenWrite() method Here s the code to open the file c:\binaryfilebin for binary writing: BinaryWriter w = new BinaryWriter(FileOpenWrite(@"c:\binaryfilebin")); NET concentrates on stream objects, rather than the source or destination for the data This means you can write binary data to any type of stream, whether it represents a file or some other type of storage location, using the same code.

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