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ASP.NET MVC: Model in strongly typed view not populating

I am brand spanking new to ASP.NET MVC and I'm working through a tutorial to get the basics. The tutorial is in C# and I'm converting it to VB to stay consistent with some related projects. I have to assume that I'm missing something in that conversion but can't figure out what it could be.

I have the following class:

Public Class GuestResponse
    Public Name As String
    Public Email As String
    Public Phone As String
    Public WillAttend As Boolean?
End Class

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and a strongly-typed view related to that class:

@ModelType PartyInvites.GuestResponse

@Code
    Layout = Nothing
End Code

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>RsvpForm</title>
</head>
<body>
    @Using Html.BeginForm
        @<p>Your name: @Html.TextBoxFor(Of String)(Function(x) x.Name)</p>
        @<p>Your email: @Html.TextBoxFor(Of String)(Function(x) x.Email)</p>
        @<p>Your phone: @Html.TextBoxFor(Of String)(Function(x) x.Phone)</p>
        @<p>
            Will you attend?
            @Html.DropDownListFor(Of Boolean?)(Function(x) x.WillAttend,
                                                        New SelectListItem() {New SelectListItem With {.Text = "Yes, I'll be there", .Value = Boolean.TrueString},
                                                        New SelectListItem With {.Text = "No, I can't come", .Value = Boolean.FalseString}}, "Choose an option")
        </p>
        @<input type="submit" value="Submit RSVP" />
    End Using
</body>
</html>

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My controller has a simple action method that takes that class and responds with another view:

<HttpPost>
Function RsvpForm(g As GuestResponse) As ViewResult
    'TODO: Email response to the party organizer
    Return View("Thanks", g)
End Function

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Unfortunately, the form data from the post request isn't being populated in my GuestResponse class. If I insert a breakpoint in that action method, all the GuestResponse properties are empty. At the same time, the Request.Form values look as expected - they're just not filling in the GuestResponse object.

I'm sure it's something small I'm missing. Any help is appreciated.
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mcorrente
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