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Writing these as two separate C# methods helps keep your code tidy, since the two methods have totally different responsibilities. However, from outside, the pair of C# methods will be seen as a single logical action, since they will have the same name and are invoked by requesting the same URL. Replace your current single RsvpForm() method with the following: [HttpGet] public ViewResult RsvpForm() { return View(); } [HttpPost] public ViewResult RsvpForm(GuestResponse guestResponse) { // To do: E-mail guestResponse to the party organizer return View("Thanks", guestResponse); }

page, but we re going to skip over it in this chapter. The method we suggest for navigation of this type is to use unordered lists styled in CSS, and this is covered in full in 12. In addition, page headings and body copy are common features on web pages, but we re going to skip them here and simply refer you to another chapter that deals with them in greater detail the next chapter, in fact, which is all about typography.

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Reference types or value types can obviously be passed as parameters to methods. However, passing a reference type (e.g., a class) by reference is quite different from passing it by value. To understand the distinction, assume you have a simple Person class defined in a new Console Application project named RefTypeValTypeParams, defined as follows: class Person { public string personName; public int personAge; // Constructors. public Person(string name, int age) {

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

Tip You ll need to import the PartyInvites.Models namespace; otherwise, Visual Studio won t recognize the type GuestResponse. The least brain-taxing way to do this is to position the caret on the unrecognized word, GuestResponse, and then press Ctrl+dot. When the prompt appears, press Enter. Visual Studio will automatically import the correct namespace for you.

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.

No doubt you can guess what the [HttpGet] and [HttpPost] attributes do. When present, they restrict which type of HTTP request an action will respond to. The first RsvpForm() overload will only respond to GET requests; the second RsvpForm() overload will only respond to POST requests.

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