Listing 2-1. The default contents of the HomeController class

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace PartyInvites.Controllers{    public class HomeController : Controller    {        public ActionResult Index()        {            return View();        }    }}

Listing 2-2. Modifying the HomeController Class

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace PartyInvites.Controllers{    public class HomeController : Controller    {        public string Index()        {            return "Hello World";        }    }}

Listing 2-3. Modifying the Controller to Render a View

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace PartyInvites.Controllers{    public class HomeController : Controller    {        public ViewResult Index()        {            return View();        }    }}

Listing 2-4. Adding to the View HTML

@{    Layout = null;}    
              
      
               Hello World (from the view)    
      

Listing 2-5. Setting Some View Data

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace PartyInvites.Controllers{    public class HomeController : Controller    {        public ViewResult Index()        {            int hour = DateTime.Now.Hour;            ViewBag.Greeting = hour < 12 ? "Good Morning" : "Good Afternoon";            return View();        }    }}

Listing 2-6. Retrieving a ViewBag Data Value

@{    Layout = null;}    
              
      
               @ViewBag.Greeting World (from the view)    
      

Listing 2-7. Displaying Details of the Party

@{    Layout = null;}    
              
      
               @ViewBag.Greeting World (from the view)        
       
            We're going to have an exciting party.
            (To do: sell it better. Add pictures or something.)        
    
      

Listing 2-8. The GuestResponse Domain Class

using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace PartyInvites.Models{    public class GuestResponse    {        public string Name { get; set; }        public string Email { get; set; }        public string Phone { get; set; }        public bool? WillAttend { get; set; }    }}

Listing 2-9. Adding a Link to the RSVP Form

@{    Layout = null;}    
              
      
               @ViewBag.Greeting World (from the view)        
       
            We're going to have an exciting party.
            (To do: sell it better. Add pictures or something.)        
        @Html.ActionLink("RSVP Now", "RsvpForm")    
      

Listing 2-10. Adding a New Action Method to the Controller

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace PartyInvites.Controllers{    public class HomeController : Controller    {        public ViewResult Index()        {            int hour = DateTime.Now.Hour;            ViewBag.Greeting = hour < 12 ? "Good Morning" : "Good Afternoon";            return View();        }        public ViewResult RsvpForm()        {            return View();        }    }}

Listing 2-12. The initial contents of the RsvpForm.cshtml file

@model PartyInvites.Models.GuestResponse@{    Layout = null;}    
              
      
            
      

Listing 2-13. Creating a Form View

@model PartyInvites.Models.GuestResponse@{    Layout = null;}    
              @using (Html.BeginForm()) {         
Your name: @Html.TextBoxFor(x => x.Name)
        
Your name: @Html.TextBoxFor(x => x.Email)
        
Your name: @Html.TextBoxFor(x => x.Phone)
        
            Will you attend?            @Html.DropDownListFor(x => x.WillAttend,             new[]{                new SelectListItem(){Text = "Yes, I'll be there", Value = bool.TrueString},                new SelectListItem(){Text = "No, I can't come", Value = bool.FalseString}            },             "Choose an option")        
            }

Listing 2-14. Adding an Action Method to Support POST Requests

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using PartyInvites.Models;namespace PartyInvites.Controllers{    public class HomeController : Controller    {        public ViewResult Index()        {            int hour = DateTime.Now.Hour;            ViewBag.Greeting = hour < 12 ? "Good Morning" : "Good Afternoon";            return View();        }        [HttpGet]        public ViewResult RsvpForm()        {            return View();        }        [HttpPost]        public ViewResult RsvpForm(GuestResponse guestResponse)        {            // TODO: Email response to the party organizer            return View("Thanks", guestResponse);        }    }}

Listing 2-15. The Thanks View

@model PartyInvites.Models.GuestResponse@{    Layout = null;}    
              
      
        
       
Thanks you, @Model.Name!
            @if (Model.WillAttend == true) {             @:It's great that you're coming. The drinks area already in the fridge!        } else {            @:Sorry to hear that you can't make it, but thanks for letting us know.        }    
      

Listing 2-16. Applying Validation to the GuestResponse Model Class

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.ComponentModel.DataAnnotations;namespace PartyInvites.Models{    public class GuestResponse    {        [Required(ErrorMessage = "Please enter your name")]        public string Name { get; set; }        [Required(ErrorMessage = "Please enter your email address")]        [RegularExpression(".+\\@.+\\..+",             ErrorMessage = "Please enter a valid email address")]        public string Email { get; set; }        [Required(ErrorMessage = "Please enter your phone number")]        public string Phone { get; set; }        [Required(ErrorMessage = "Please specify whether you'll attend")]        public bool? WillAttend { get; set; }    }}

Listing 2-17. Checking for Form Validation Errors

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using PartyInvites.Models;namespace PartyInvites.Controllers{    public class HomeController : Controller    {        public ViewResult Index()        {            int hour = DateTime.Now.Hour;            ViewBag.Greeting = hour < 12 ? "Good Morning" : "Good Afternoon";            return View();        }        [HttpGet]        public ViewResult RsvpForm()        {            return View();        }        [HttpPost]        public ViewResult RsvpForm(GuestResponse guestResponse)        {            if (ModelState.IsValid)            {                // TODO: Email response to the party organizer                return View("Thanks", guestResponse);            }            else             {                 // there is validation error                return View();            }        }    }}

Listing 2-18. Using the Html.ValidationSummary Help Method

@model PartyInvites.Models.GuestResponse@{    Layout = null;}    
              @using (Html.BeginForm()) {         @Html.ValidationSummary()        
Your name: @Html.TextBoxFor(x => x.Name)
        
Your email: @Html.TextBoxFor(x => x.Email)
        
Your phone: @Html.TextBoxFor(x => x.Phone)
        
            Will you attend?            @Html.DropDownListFor(x => x.WillAttend,             new[]{                new SelectListItem(){Text = "Yes, I'll be there", Value = bool.TrueString},                new SelectListItem(){Text = "No, I can't come", Value = bool.FalseString}            },             "Choose an option")        
            }

Listing 2-19. The contents of the Content/Site.css file

.field-validation-error {
        color: #f00;}.field-validation-valid {
         display: none;}.input-validation-error {
         border: 1px solid #f00;     background-color: #fee; }.validation-summary-errors {
         font-weight: bold;     color: #f00;}.validation-summary-valid {
         display: none;}

Listing 2-20. Adding the link element to the RsvpForm view

@model PartyInvites.Models.GuestResponse@{    Layout = null;}    
          
              @using (Html.BeginForm()) {         @Html.ValidationSummary()        
Your name: @Html.TextBoxFor(x => x.Name)
        
Your email: @Html.TextBoxFor(x => x.Email)
        
Your phone: @Html.TextBoxFor(x => x.Phone)
        
            Will you attend?            @Html.DropDownListFor(x => x.WillAttend,             new[]{                new SelectListItem(){Text = "Yes, I'll be there", Value = bool.TrueString},                new SelectListItem(){Text = "No, I can't come", Value = bool.FalseString}            },             "Choose an option")        
            }

Listing 2-21. Using the WebMail Helper

@model PartyInvites.Models.GuestResponse@{    Layout = null;}    
              @{        try        {            WebMail.SmtpServer = "smtp.example.com";            WebMail.SmtpPort = 587;            WebMail.EnableSsl = true;            WebMail.UserName = "mySmtpUsername";            WebMail.Password = "mySmtpPassword";            WebMail.From = "rsvps@example.com";                        WebMail.Send("party-host@example.com", "RSVP Notification",                 Model.Name + " is " + ((Model.WillAttend ?? false) ? " " : "not ") + "attending");        }        catch(Exception)        {            @:Sorry - we coundn't send the email to confirm your RSVP.        }    }    
      
        
       
Thanks you, @Model.Name!
            @if (Model.WillAttend == true) {             @:It's great that you're coming. The drinks area already in the fridge!        } else {            @:Sorry to hear that you can't make it, but thanks for letting us know.        }