I have created a contact form using the guide found here:

https://our.umbraco.org/documentation/getting-started/Code/Creating-Forms/

This is my partial form for the form:

@model LoevbjergRema1000Umbraco.Models.ContactFormViewModel

@using (Html.BeginUmbracoForm("Submit", "Contact"))
{
    <div class="col-sm-8">
        <div class="row">
            <div class="col-sm-4">
                <form class="form-inline" id="kontaktForm">
                    <div class="form-group">
                        <label for="">Navn</label>
                        @Html.TextBoxFor(m => m.Navn, new { @class = "form-control", @placeholder = "Indtast navn..." })
                        @Html.ValidationMessageFor(m => m.Navn)
                        <label for="">Addresse</label>
                        @Html.TextBoxFor(m => m.Addresse, new { @class = "form-control", @placeholder = "Indtast addresse..." })
                        <label for="">Postnr. + by</label>
                        @Html.TextBoxFor(m => m.PostNrBy, new { @class = "form-control", @placeholder = "Indtast postnr & by..." })
                        <label for="">Telefon</label>
                        @Html.TextBoxFor(m => m.Telefon, new { @class = "form-control", @placeholder = "Indtast telefonnr..." })
                        <label for="">Email</label>
                        @Html.TextBoxFor(m => m.Email, new { @class = "form-control", @placeholder = "Indtast email..." })
                        @Html.ValidationMessageFor(m => m.Email)
                    </div>
                </form>
            </div>
            <div class="col-sm-8">
                <label for="">Skriv din besked</label>
                @Html.TextAreaFor(m => m.Message, new { @class ="form-control", @id = "kontaktBesked", @rows = "11", @placeholder = "Indtast din besked her..."})
                @Html.ValidationMessageFor(m => m.Message)
                <button class="btn_1 pull-right contact-btn" name="submit" type="submit">Afsend Besked</button>
                <button class="btn_1 contact-btn">Ryd felter</button>
            </div>
        </div>
    </div>
}

This is my model:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace LoevbjergRema1000Umbraco.Models
{
    public class ContactFormViewModel
    {
        [Required(ErrorMessage = "Navn påkrævet")]
        public string Navn { get; set; }

        public string Addresse { get; set; }
        public string PostNrBy { get; set; }
        public string Telefon { get; set; }

        [EmailAddress(ErrorMessage = "Ugyldig email-addresse")]
        public string Email { get; set; }

        [Required(ErrorMessage = "Besked påkrævet")]
        public string Message { get; set; }
    }
}

And this is my controller:

using LoevbjergRema1000Umbraco.Models;
using System.Net.Mail;
using System.Web.Mvc;
using Umbraco.Web.Mvc;

namespace LoevbjergRema1000Umbraco.Controllers
{
    public class ContactController : SurfaceController
    {
        [HttpPost]
        public ActionResult Submit(ContactFormViewModel model)
        {
            if (!ModelState.IsValid) //validation
                return CurrentUmbracoPage();

            // Send mail using SMTP
            MailMessage mailMessage = new MailMessage();
            mailMessage.To.Add("[email protected]");
            mailMessage.From = new MailAddress(model.Email);
            mailMessage.Subject = "Kontakt mail";
            mailMessage.Body = "Navn: " + model.Navn + "\nAddresse: " + model.Addresse + ", " +
                model.PostNrBy + "\nTelefon: " + model.Telefon + "\n" + model.Message;

            SmtpClient smtpClient = new SmtpClient("smtp.curanet.dk");
            smtpClient.Send(mailMessage);

            return RedirectToCurrentUmbracoPage();
        }
    }
}

But when i submit the form, it only refreshes the page, no mail is being sent. Is the guide outdated? Is there a better way to achieve this? The contact form is really simple and should just clear the fields and perhaps give a small notification saying the mail was sent to the user. I don't have any client side validation at the moment, but i plan on implementing that later on. The server side validation I have now doesn't seem to work either.