[MVC2 -C#] - Client Validation

Code:
public class GuestResponse
    {
        [Required(ErrorMessage = "You must enter a 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")]
        [RegularExpression("^[0-9]+$", ErrorMessage = "Only numbers are allowed")]
        public string Phone { get; set; }
       
        [Required(ErrorMessage = "Please specify whether you'll attend")]
        public bool? WillAttend { get; set; }
    }

Code:
<html xmlns="http://www.w3.org/1999/xhtml" >
    
<head runat="server">
    <title>RsvpForm</title>    

<script src="../../Scripts/jquery-1.4.1.js" type="text/javascript"></script>  
<script src="../../Scripts/jquery.validate.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftAjax.js" type="text/javascript"></script>     
<script src="../../Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>
    
</head>
<body>
<h1>RSVP</h1>
    
<%Html.EnableClientValidation(); %>

<% using(Html.BeginForm()) { %>
...

Code:
<script src="<%: Url.Content("~/Scripts/MicrosoftAjax.js") %>" type="text/javascript"></script>
<script src="<%: Url.Content("~/Scripts/MicrosoftMvcValidation.js") %>" type="text/javascript"></script>

Code:

 [HttpGet]
        public ViewResult RsvpForm()
        {
            return View();
        }
        [HttpPost]
        public ViewResult RsvpForm(GuestResponse guestResponse)
        {
            if (ModelState.IsValid)
            {
                // To do: E-mail guestResponse to the party organizer
                return View("Thanks", guestResponse);
            }
            else // Validation error, so redisplay data entry form
                return View();
        }

Code:

<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<PartyInvites.Models.GuestResponse>" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
    
<head runat="server">
    <title>RsvpForm</title>    

<script src="<%: Url.Content("~/Scripts/MicrosoftAjax.js") %>" type="text/javascript"></script>
 <script src="<%: Url.Content("~/Scripts/MicrosoftMvcValidation.js") %>" type="text/javascript"></script>
    
</head>
<body>
<h1>RSVP</h1>
    
<%Html.EnableClientValidation(); %>

<% using(Html.BeginForm()) { %>
<%: Html.ValidationSummary() %>
<p>Your name: <%: Html.TextBoxFor(x => x.Name) %></p>
<p>Your email: <%: Html.TextBoxFor(x => x.Email) %></p>
<p>Your phone: <%: Html.TextBoxFor(x => x.Phone) %></p>
<p>
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") %>
</p>
<input type="submit" value="Submit RSVP" />
<% } %>

<%: Html.ActionLink("Return to main menu", "Index") %>
</body>
</html>

Code:
[HttpPost]
public ViewResult RsvpForm(GuestResponse guestResponse)
{
    if (ModelState.IsValid)
    {
        // To do: E-mail guestResponse to the party organizer
        return View("Thanks", guestResponse);
    }
    else // Validation error, so redisplay data entry form
    {
        return View(guestResponse);
    }
}

Code:

<appSettings>
    <add key="ClientValidationEnabled" value="true"/>
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/>
  </appSettings>

Code:
<%: Html.ValidationMessageFor(x => x.Name) %>
<%: Html.ValidationMessageFor(x => x.Email) %>
<%: Html.ValidationMessageFor(x => x.Phone) %>
...