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In the rare case that you do build a C# class that uses unmanaged resources, you will obviously want to ensure that the underlying memory is released in a predictable manner. Suppose you have created a new C# Console Application named SimpleFinalize and inserted a class named MyResourceWrapper that uses an unmanaged resource (whatever that may be) and you want to override Finalize(). The odd thing about doing so in C# is that you can t do it using the expected override keyword: class MyResourceWrapper { // Compile-time error! protected override void Finalize(){ } } Rather, when you want to configure your custom C# class types to override the Finalize() method, you make use of a (C++-like) destructor syntax to achieve the same effect. The reason for this alternative form of overriding a virtual method is that when the C# compiler processes the finalizer syntax, it automatically adds a good deal of required infrastructure within the implicitly overridden Finalize() method (shown in just a moment). C# finalizers look very similar to constructors in that they are named identically to the class they are defined within. In addition, finalizers are prefixed with a tilde symbol (~). Unlike a constructor, however, a finalizer never takes an access modifier (they are implicitly protected), never takes parameters, and can t be overloaded (only one finalizer per class). Here is a custom finalizer for MyResourceWrapper that will issue a system beep when invoked. Obviously, this example is only for instructional purposes. A real-world finalizer would do nothing more than free any unmanaged resources and would not interact with other managed objects, even those

Tip When running Drupal on a web server cluster, the location of the temporary files directory needs to be shared by all web servers. Because Drupal may use one request to upload the file and a second to change its status from temporary to permanent, many load-balancing schemes will result in the temp file going to one server while the second request goes to another. When this happens, files will appear to upload properly, but will never appear in the nodes or content to which they re attached. Ensure that all your web servers are using the same shared temp directory, and use a sessions-based load balancer. Your files directory, like your database, should be global to your web servers.

The Main() method is responsible for prompting the user for a specific course of action and executing that request using a switch statement. This program allows the user to enter the following commands: I: Inserts a new record into the Inventory table. U: Updates an existing record in the Inventory table. D: Deletes an existing record from the Inventory table. L: Displays the current inventory using a data reader. S: Shows these options to the user. P: Looks up pet name from car ID. Q: Quits the program.

Each possible option is handled by a unique static method within the Program class. The next snippet shows the complete implementation of Main(). Notice that each method invoked from the do/while loop (with the exception of the ShowInstructions() method) takes an InventoryDAL object as its sole parameter: static void Main(string[] args) { Console.WriteLine("***** The AutoLot Console UI *****\n"); // Get connection string from App.config. string cnStr = ConfigurationManager.ConnectionStrings["AutoLotSqlProvider"].ConnectionString; bool userDone = false; string userCommand = ""; // Create our InventoryDAL object. InventoryDAL invDAL = new InventoryDAL(); invDAL.OpenConnection(cnStr); // Keep asking for input until user presses the Q key. try { ShowInstructions(); do { Console.Write("\nPlease enter your command: "); userCommand = Console.ReadLine(); Console.WriteLine(); switch (userCommand.ToUpper()) {

case "I": InsertNewCar(invDAL); break; case "U": UpdateCarPetName(invDAL); break; case "D": DeleteCar(invDAL); break; case "L": ListInventory(invDAL); break; case "S": ShowInstructions(); break; case "P": LookUpPetName(invDAL); break; case "Q": userDone = true; break; default: Console.WriteLine("Bad data! break; } } while (!userDone); } catch (Exception ex) { Console.WriteLine(ex.Message); } finally { invDAL.CloseConnection(); } }

In private download mode, the files folder can be located anywhere PHP may read and write, and need not be (and in most cases ought not be) directly accessible by the web server itself. The security of private files comes at a performance cost. Rather than delegating the work of file serving to the web server, Drupal takes on the responsibility of checking access permissions and serving out the files, and Drupal is fully bootstrapped on every file request.

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