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Of course, in some cases you do need to update the same file in response to actions taken by multiple users. One approach is to use locking. The basic technique is to create a separate class that performs all the work of retrieving the data. Once you ve defined this class, you can create a single global instance of it and add it to the Application collection. Now you can use the C# lock statement to ensure that only one thread can access this object at a time (and hence only one thread can attempt to open the file at once). For example, imagine you create the following Logger class, which updates a file with log information when you call the LogMessage() method, as shown here: public class Logger { public void LogMessage() { lock (this) { // (Open the file and update it.) } } }

Note the liberal use of here. If an instance of a form already exists with exactly the same values, there s no sense saving the whole thing twice. Instead, it simply relies on the fact that the previous copy will be functionally identical, so it ll work for both.

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The Logger class locks itself before accessing the log file, creating a critical section This ensures that only one thread can execute the LogMessage() code at a time, removing the danger of file conflicts However, for this to work you must make sure every class is using the same instance of the Logger object You have a number of options here for example, you could respond to the HttpApplicationStart event in the globalasax file to create a global instance of the Logger class and store it in the Application collection Alternatively, you could expose a single Logger instance through a static variable in the globalasax file, as shown here: private log = new Logger(); public Logger Log { get { return Logger; } } Now any page that uses the Logger to call LogMessage() gets exclusive access: // Update the file safely ApplicationLog.

LogMessage(myMessage); Keep in mind that this approach is really just a crude way to compensate for the inherit limitations of a file-based system It won t allow you to manage more complex tasks, such as having individual users read and write pieces of text in the same file at the same time Additionally, while a file is locked for one client, other requests will have to wait This is guaranteed to slow down application performance and lead to an exception if the object isn t released before the second client times out Unless you invest considerable effort refining your threading code (for example, you can use classes in the SystemThreading namespace to test if an object is available and take alternative action if it isn t), this technique is suitable only for small-scale web applications It s for this reason that ASP .

NET applications almost never use file-based logs instead, they write to the Windows event log or a database..

Now that forms can be placed in the database without being fully processed, or even validated, their usefulness is still limited if they can t be retrieved later, for the user to continue working on them The data is stored in such a way that it can be reassembled into a form, all that s left is to actually do so Since the code to do this must, by definition, be called prior to having a form instance to work with, it may seem like it must be in a module-level function Remember that methods can be declared to be used on the class, rather than the instance, if the need arises Since the goal here is to have all of this functionality encapsulated on a subclass, without having to worry about where all the machinery itself is written, a class method will do the trick here quite well.

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