ASP.NET MVC 4 Web Api ajax file upload

I am developing some sort of service using asp.net mvc 4 web api. On one form user must upload few files and then submit form to server. Problem is in ajax file upload to asp.net mvc web api. I have already implemented upload without ajax. But i need it's done with ajax. This is implementation of

public Task<HttpResponseMessage> PostJob()
{
    if (!Request.Content.IsMimeMultipartContent())
    {
        throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.UnsupportedMediaType));
    }

    string path = HttpContext.Current.Server.MapPath(string.Format("~/Resources/Documents"));
    MultipartFormDataStreamProvider provider = new MultipartFormDataStreamProvider(path);
    var request = Request.Content.ReadAsMultipartAsync(provider);

    var task = request.ContinueWith<HttpResponseMessage>(t =>
    {
        if (t.IsFaulted || t.IsCanceled)
        {
            return new HttpResponseMessage(HttpStatusCode.InternalServerError);
        }

        string fileName = provider.BodyPartFileNames.FirstOrDefault().Value;
        string originalName = provider.BodyPartFileNames.FirstOrDefault().Key.TrimStart('"').TrimEnd('"');
        string RandomName = provider.BodyPartFileNames.First().Value + Path.GetExtension(originalName);

        FileInfo file = new FileInfo(fileName);
        file.CopyTo(Path.Combine(path, originalName), true);
        file.Delete();


        return new HttpResponseMessage(HttpStatusCode.Created);

    });

I have found article that does this using HTML5 http://www.strathweb.com/2012/04/html5-drag-and-drop-asynchronous-multi-file-upload-with-asp-net-webapi/. I need this work in IE8. Maybe you have any ideas?

Any help is appreciated, Iryna.