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As you might suspect, it is possible to blend both techniques into a single class definition. By doing so, you gain the best of both models. If the object user does remember to call Dispose(), you can inform the garbage collector to bypass the finalization process by calling GC.SuppressFinalize(). If the object user forgets to call Dispose(), the object will eventually be finalized and have a chance to free up the internal resources. The good news is that the object s internal unmanaged resources will be freed one way or another. Here is the next iteration of MyResourceWrapper, which is now finalizable and disposable, defined in a C# Console Application named FinalizableDisposableClass: // A sophisticated resource wrapper. public class MyResourceWrapper : IDisposable { // The garbage collector will call this method if the // object user forgets to call Dispose(). ~MyResourceWrapper() { // Clean up any internal unmanaged resources. // Do **not** call Dispose() on any managed objects. } // The object user will call this method to clean up // resources ASAP. public void Dispose() { // Clean up unmanaged resources here. // Call Dispose() on other contained disposable objects. // No need to finalize if user called Dispose(), // so suppress finalization. GC.SuppressFinalize(this); } } Notice that this Dispose() method has been updated to call GC.SuppressFinalize(), which informs the CLR that it is no longer necessary to call the destructor when this object is garbage-collected, given that the unmanaged resources have already been freed via the Dispose() logic.

Even when you use hash codes, the view state data will still be readable. To prevent users from getting any view state information, you can enable view state encryption. You can turn on encryption for an individual page using the ViewStateEncryptionMode property of the Page directive: <%@Page ViewStateEncryptionMode="Always"> Or you can set the same attribute in the web.config configuration file: <pages viewStateEncryptionMode="Always"> Either way, this enforces encryption. You have three choices for your view state encryption setting always encrypt (Always), never encrypt (Never), or encrypt only if a control specifically requests it (Auto). The default is Auto, which means a control must call the Page.RegisterRequiresViewStateEncryption() method to request encryption. If no control calls this method to indicate it has sensitive information, the view state is not encrypted, thereby saving the encryption overhead. On the other hand, a control doesn t have absolute power if it calls Page.RegisterRequiresViewStateEncryption() and the encryption mode is Never, the view state won t be encrypted. When hashing or encrypting data, ASP.NET uses the computer-specific key defined in the <machineKey> section of the machine.config file, described in 5. By default, you won t actually see the definition for the <machineKey> because it s initialized programmatically. However, you can see the equivalent content in the machine.config.comments files, and you can explicitly add the <machineKey> element if you want to customize its settings.

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In the real world, an end user has the option of supplying command-line arguments when starting a program. However, during the development cycle, you may wish to specify possible command-line flags for testing purposes. To do so with Visual Studio 2010, double-click the Properties icon from Solution Explorer and select the Debug tab on the left side. From there, specify values using the command-line arguments text box (see Figure 3-3).

Don t encrypt view state data if you don t need to do so. The encryption will impose a performance penalty, because the web server needs to perform the encryption and decryption with each postback.

Figure 3-3. Setting command arguments via Visual Studio 2010 Once you have established such command-line arguments, they will automatically be passed to the Main() method when debugging or running your application within the Visual Studio IDE.

One of the most significant limitations with view state is that it s tightly bound to a specific page. If the user navigates to another page, this information is lost. This problem has several solutions, and the best approach depends on your requirements.

The Environment class exposes a number of extremely helpful methods beyond GetCommandLineArgs(). Specifically, this class allows you to obtain a number of details regarding the operating system currently

hosting your .NET application using various static members. To illustrate the usefulness of System.Environment, update your Main() method to call a helper method named ShowEnvironmentDetails(). static int Main(string[] args) { ... // Helper method within the Program class. ShowEnvironmentDetails(); Console.ReadLine(); return -1; } Implement this method within your Program class to call various members of the Environment type. static void ShowEnvironmentDetails() { // Print out the drives on this machine, // and other interesting details. foreach (string drive in Environment.GetLogicalDrives()) Console.WriteLine("Drive: {0}", drive); Console.WriteLine("OS: {0}", Environment.OSVersion); Console.WriteLine("Number of processors: {0}", Environment.ProcessorCount); Console.WriteLine(".NET Version: {0}", Environment.Version); } Figure 3-4 shows a possible test run of invoking this method. If you did not specify command-line arguments via the Visual Studio 2010 Debug tab, you will not find them printed to the console.

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