I extended the Umbraco model.generated with a custom model and I have an Umbraco form in a partial view returning to my controller with a post. I read a bunch of posts, but I can't figure out why my form returns an empty model to my controller. I set a breakpoint at the beginning of my function in my controller and no matter what I entered in the form, all the fields are null.

Here is my controller :

[HttpGet]
    public ActionResult Register(Register model)
    {
        return PartialView("_Register", model);
    }

    [HttpPost]
    [ActionName("Register")]
    public ActionResult RegisterPost(Register model)
    {
        return PartialView("_Register", model);
    }

    [HttpPost]
    public ActionResult SendRegistration(Register model)
    {

Bunch of validation and code of model isValid What matters is that model.FirstName, model.LastName ... are all null

        return CurrentUmbracoPage();
    }

Here is my model:

namespace Umbraco.Web.PublishedContentModels{
public partial class Register
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string PhoneNumber { get; set; }
    public string EmailAddress { get; set; }
    public string ConfirmEmailAddress { get; set; }
    public string Password { get; set; }
    public string ConfirmPassword { get; set; }
    public bool NewsLetterOptIn { get; set; }
    public bool AcceptConditions { get; set; }
    public string GroupKey { get; set; }
}

And finally here is my form partial view:

@using System.Web.Mvc.Html
@using Lancite.EPhoto3.API.Extensions
@using Umbraco.Web
@using EphotoUmbraco.Controllers
@inherits Umbraco.Web.Mvc.UmbracoViewPage<ContentModels.Register>
@using ContentModels = Umbraco.Web.PublishedContentModels

...

@*, "Account", FormMethod.Post, new { @role = "form", @name = "frmRegister", @id = "frmRegister" }))*@
            @using (Html.BeginUmbracoForm<AccountController>("SendRegistration"))
            {
                <div class="form-box">
                    <div class="row">
                        <div class="col-xs-12">
                            <div class="header">
                                <h2>@Umbraco.GetDictionaryValue("CreateAccount")</h2>
                                <p>@Umbraco.GetDictionaryValue("AlreadyHaveAccount") <a href="@Url.Action("Login", "Account")">@Umbraco.GetDictionaryValue("Here")</a> @Umbraco.GetDictionaryValue("ToLogin")</p>
                            </div>

                            @Html.LabelFor(m => m.FirstName, Umbraco.GetDictionaryValue("FirstName"), new { @class = "control-label" })
                            <div class="margin-bottom-20 @Html.ValidationErrorFor(m => m.FirstName, "has-error")">
                                @Html.TextBoxFor(m => m.FirstName, new { @class = "form-control", @type = "text", @tabindex = "1" })
                            </div>

                            @Html.LabelFor(m => m.LastName, Umbraco.GetDictionaryValue("LastName"), new { @class = "control-label" })
                            <div class="margin-bottom-20 @Html.ValidationErrorFor(m => m.LastName, "has-error")">
                                @Html.TextBoxFor(m => m.LastName, new { @class = "form-control", @type = "text", @tabindex = "2" })
                            </div>

                            @Html.HiddenFor(m => m.GroupKey)

                            @Html.LabelFor(m => m.PhoneNumber, Umbraco.GetDictionaryValue("PhoneNumber"), new { @class = "control-label" })
                            <div class="margin-bottom-20 @Html.ValidationErrorFor(m => m.PhoneNumber, "has-error")">
                                @Html.TextBoxFor(m => m.PhoneNumber, new { @class = "form-control", @type = "tel", @tabindex = "3" })
                            </div>
                        </div>
                    </div>
                    <div class="row">
                        <div class="col-sm-6">
                            @Html.LabelFor(m => m.EmailAddress, Umbraco.GetDictionaryValue("Email"), new { @class = "control-label" })
                            <div class="margin-bottom-20 @Html.ValidationErrorFor(m => m.EmailAddress, "has-error")">
                                @Html.TextBoxFor(m => m.EmailAddress, new { @class = "form-control", @type = "email", @tabindex = "4" })
                            </div>
                        </div>
                        <div class="col-sm-6">
                            @Html.LabelFor(m => m.ConfirmEmailAddress, Umbraco.GetDictionaryValue("ConfirmEmail"), new { @class = "control-label" })
                            <div class="margin-bottom-20 @Html.ValidationErrorFor(m => m.ConfirmEmailAddress, "has-error")">
                                @Html.TextBoxFor(m => m.ConfirmEmailAddress, new { @class = "form-control", @type = "email", @tabindex = "5" })
                            </div>
                        </div>
                    </div>

... bunch of other fields ...

                    <div class="row">
                        <div class="col-lg-8">
                            <label class="checkbox remember">
                                @Html.CheckBoxFor(m => m.AcceptConditions)
                                @Html.LabelFor(m => m.AcceptConditions)<span> <b><a href="@Url.Action("TermsOfUse", "Home")" target="_blank">@Umbraco.GetDictionaryValue("TermsOfUse")</a></b></span>
                            </label>
                            <label class="checkbox remember">
                                @Html.CheckBoxFor(m => m.NewsLetterOptIn)
                                <label for="NewsLetterOptIn">@Umbraco.GetDictionaryValue("ReceiveInfoLetter")</label>
                            </label>
                            <ul>
                                @Umbraco.GetDictionaryValue("InfoLetterDetails")
                            </ul>
                            <div class="font-bold">@Umbraco.GetDictionaryValue("WithdrawConsent")</div>
                        </div>
                        <div class="col-md-4" id="btnSubmitContainer">
                            <button class="btn btn-u btn-u-default btn-create-account" type="submit" id="btnSubmitRegister">@Umbraco.GetDictionaryValue("Continue")</button>
                        </div>
                    </div>
                </div>
            }

Sorry for the bunch of code, most of it is repetition or really quick to understand.

Basically, why are the parameters model in SendRegistration(Register model) in my controller empty