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One of the biggest headaches a web developer faces during a development cycle is deploying a completed application to a production server. Not only do the web-page files, databases, and components need to be transferred, but you also need to register components and re-create a slew of configuration settings. ASP.NET simplifies this process considerably. Every installation of the .NET Framework provides the same core classes. As a result, deploying an ASP.NET application is relatively simple. In most cases, you simply need to copy all the files to a virtual directory on a production server (using an FTP program or even a command-line command like XCOPY). As long as the host machine has the .NET Framework, there are no time-consuming registration steps. Distributing the components your application uses is just as easy. All you need to do is copy the component assemblies when you deploy your web application. Because all the information about your component is stored directly in the assembly file metadata, there s no need to launch a registration program or modify the Windows registry. As long as you place these components in the correct place (the Bin subdirectory of the web application directory), the ASP.NET engine automatically detects them and makes them available to your web-page code. Try that with a traditional COM component! Configuration is another challenge with application deployment, particularly if you need to transfer security information such as user accounts and user privileges. ASP .NET makes this deployment process easier by minimizing the dependence on settings in IIS (Internet Information Services). Instead, most ASP .NET settings are stored in a dedicated web.config file. The web.config file is placed in the same directory as your web pages. It contains a hierarchical grouping of application settings

personName = name; personAge = age; } public Person(){} public void Display() { Console.WriteLine("Name: {0}, Age: {1}", personName, personAge); } } Now, what if you create a method that allows the caller to send in the Person object by value (note the lack of parameter modifiers, such as out or ref): static void SendAPersonByValue(Person p) { // Change the age of "p" p.personAge = 99; // Will the caller see this reassignment p = new Person("Nikki", 99); } Notice how the SendAPersonByValue() method attempts to reassign the incoming Person reference to a new Person object as well as change some state data. Now let s test this method using the following Main() method: static void Main(string[] args) { // Passing ref-types by value. Console.WriteLine("***** Passing Person object by value *****"); Person fred = new Person("Fred", 12); Console.WriteLine("\nBefore by value call, Person is:"); fred.Display(); SendAPersonByValue(fred); Console.WriteLine("\nAfter by value call, Person is:"); fred.Display(); Console.ReadLine(); } The following is the output of this call. ***** Passing Person object by value ***** Before by value call, Person is: Name: Fred, Age: 12 After by value call, Person is: Name: Fred, Age: 99

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' Loop through the random byte array and append each value ' to the StringBuilder. Dim i As Integer = 0 Do While i < random.Length machineKey.Append(String.Format("{0:X2}", random(i))) i += 1 Loop Return machineKey.ToString() End Function You can use this function in a web form to create the keys you need. For example, the following snippet of code creates a 48-character decryption key and a 128-character validation key, and it displays the values in two separate text boxes: txtDecryptionKey.Text = CreateMachineKey(48) txtValidationKey.Text = CreateMachineKey(128) You can then copy the information and paste it into the machine.config file for each computer in the web farm. This is a much more convenient and secure approach than creating keys by hand. You ll learn much more about the cryptography classes in the System.Security.Cryptography namespace in 25.

As you can see, the value of personAge has been modified. This behavior seems to fly in the face of what it means to pass a parameter by value. Given that you were able to change the state of the incoming Person, what was copied The answer: a copy of the reference to the caller s object. Therefore, as the SendAPersonByValue() method is pointing to the same object as the caller, it is possible to alter the object s state data. What is not possible is to reassign what the reference is pointing to.

N ote There are Maven archetypes that automatically create the BlazeDS directory structure and POM

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