Hello all, Im new to .net MVC and Im getting an error that Im not sure how to solve.

I'm trying to create a contact form, and have the controller, model, and a partial view to make it happen, but Im currently getting the following error:

The model item passed into the dictionary is of type 'Umbraco.Web.Models.RenderModel', but this dictionary requires a model item of type 'umbraco.Models.ContactModel'.

here is my Partial:

@inherits Umbraco.Web.Mvc.UmbracoViewPage<umbraco.Models.ContactModel>

<div class="ContactForm">
@using (Html.BeginUmbracoForm<umbraco.Controllers.ContactSurfaceController>("ContactForm", "ContactSurface"))
{
    @Html.ValidationSummary(true)


            <div class="FieldGroup"><label>Name</label><input type='text' name="Name" id="Name" required/></div>    
            <div class="FieldGroup"><label>Email</label><input type='text' name="Email" id="Email" required/></div>
            <div class="FieldGroup"><label>Phone</label><input type='text' name="Phone" id="Phone" /></div>
            <div class="FieldGroup"><label>Company</label><input type='text' name="Company" id="Company" /></div>
            <div class="FieldGroup"><label class="TextAreaLable">Message</label><textarea name="Message" id="Message" required></textarea></div>
            <input type="submit" value="Send Message" class="button" />

}
</div>

Here is my Model:

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

/// <summary>
/// Summary description for ContactModel
/// </summary>
namespace umbraco.Models
{
public class ContactModel
{
    [Required]
    public string Name { get; set; }
    [Required]
    public string Email { get; set; }
    public string Phone { get; set; }
    public string Company { get; set; }
    [Required]
    public string Message { get; set; }
    public int ThankYou { get; set; }
    //
    // TODO: Add constructor logic here
    //
}
}

And my Controller:

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Mail;
using System.Text;
using System.Web.Http;
using System.Web.Mvc;
using umbraco.Models;
using Umbraco.Forms.Mvc.DynamicObjects;
using Umbraco.Web.Mvc;
using Umbraco.Web.UI;


namespace umbraco.Controllers
{
public class ContactSurfaceController : SurfaceController
{
    [ChildActionOnly]
    public ActionResult ContactForm()
    { 
        //in case you need it
        var currentNode = Umbraco.TypedContent(UmbracoContext.PageId.GetValueOrDefault());

        var model = new ContactModel();
        return PartialView("ContactForm", model);
    }


    [System.Web.Mvc.HttpPost]
    public ActionResult ContactForm(ContactModel model)
    {
        if (ModelState.IsValid)
        {
            var sb = new StringBuilder();
            sb.AppendFormat("<p>Name: {0}</p>", model.Name);
            sb.AppendFormat("<p>Email: {0}</p>", model.Email);
            sb.AppendFormat("<p>Phone: {0}</p>", model.Phone);
            sb.AppendFormat("<p>Company: {0}</p>", model.Company);
            sb.AppendFormat("<p>{0}</p>", model.Message);

            SmtpClient smtp = new SmtpClient();


            MailMessage message = new MailMessage();
            message.To.Add(new MailAddress(ConfigurationManager.AppSettings["ContactAddress"]));
            message.From = new MailAddress(model.Email);
            message.Body = sb.ToString();
            message.IsBodyHtml = true;

            try
            {
                smtp.Send(message);
            }
            catch (SmtpException ex)
            {    
            //log or manage your error here, then...
                return RedirectToUmbracoPage(1337); // <-My published error page.
            }

            return RedirectToUmbracoPage(1336); // <-My published succes page.
        }

        return CurrentUmbracoPage();
    }
}
}

The error is pointing out the code that renders the partial view, so I assume it might be an issue with the partial, but I don't know what it is.

thanks for your time.