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Once you have the StreamWriter, you can use the Write() or WriteLine() method to add information to the file. Both of these methods are overloaded so that they can write many simple data types, including strings, integers, and other numbers. These values are essentially all converted into strings when they re written to a file, and they must be converted back into the appropriate types manually when you read the file. To make this process easier, you should put each piece of information on a separate line by using WriteLine() instead of Write(), as shown here: w.WriteLine("ASP.NET Text File Test"); // Write a string. w.WriteLine(1000); // Write a number. When you finish with the file, you must make sure you close it. Otherwise, the changes may not be properly written to disk, and the file could be locked open. At any time, you can also call the Flush() method to make sure all data is written to disk, as the StreamWriter will perform some inmemory caching of your data to optimize performance (which is usually exactly the behavior you want). // Tidy up. w.Flush(); w.Close(); When reading information, you use the Read() or ReadLine() method of the StreamReader. The Read() method reads a single character, or the number of characters you specify, and returns the data as a char or char array. The ReadLine() method returns a string with the content of an entire line. ReadLine() starts at the first line and advances the position to the end of the file, one line at a time. Here s a code snippet that opens and reads the file created in the previous example: StreamReader r = File.OpenText(@"c:\myfile.txt"); string inputString; inputString = r.ReadLine(); // = "ASP.NET Text File Test" InputString = r.ReadLine(); // = "1000"

Using this technique to build an entire web portal framework is possible, but it requires significant work before it would be practical. Creating this framework is a tedious, time-consuming task. In 30 you ll learn about a web parts, a native ASP .NET solution for building web portals that doesn t force you to reinvent the wheel. Web parts are based, at least in part, on user controls.

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In the hosting page, you have two choices. You can set the Format property at some point in your code by manipulating the control object, as shown here: TimeDisplay1.Format = "dddd, dd MMMM yyyy HH:mm:ss tt (GMT z)"; Your second option is to configure the user control when it s first initialized by setting the value in the control tag, as shown here: <apress:TimeDisplay id="TimeDisplay1" Format="dddd, dd MMMM yyyy HH:mm:ss tt (GMT z)" runat="server" /> <hr /> <apress:TimeDisplay id="TimeDisplay2" runat="server" /> In this example, two versions of the TimeDisplay control are created, one with a control that displays the date in the default format and another one with a custom format applied. Figure 14-3 shows the resulting page on the browser.

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);

In 11, you learned how you can cache a web page by adding the OutputCache directive to the .aspx page. This type of caching, called output caching, caches a rendered HTML version of the page, which ASP.NET can reuse automatically for future requests without executing any of your page code. One of the drawbacks with response caching is that it works on an all-or-nothing basis. It doesn t work if you need to render a portion of your page dynamically. For example, you might want to cache a table that s filled with records read from a data source so that you can limit the round-trips to the database server, but you might still need to get a fresh output for the rest of the page. If that s your situation, user controls can provide exactly what you re looking for because they can cache their own output. This feature is called partial caching, or fragment caching, and it works in almost the same way as output caching. The only difference is that you add the OutputCache directive to the user control, instead of the page. To test this feature, add the following line to the .ascx portion of a user control such as the TimeDisplay: <%@ OutputCache Duration="10" VaryByParam="None" %>

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