Copy ModelState Errors to TempData & Display them In the view

Question

Most of my action methods return PartialViews on success and RedirectToAction results on failure. For that, I would like to copy the model state errors into TempData so I could display them to the user. I've read several questions here on SO and some external links but none of them worked for me... I'm decorating the ActionMethod with ModelStateToTempData attribute from MvcContrib, then displaying it as follows in the view: (this is just a prototype)

        @if (TempData.Count > 0)
        {
            foreach (var obj in TempData)
            {
                var errors = ((ModelStateDictionary)obj.Value).Values;
                foreach (var error in errors)
                {
                <div style="position:absolute; background:Black; color:White; top:250px; left:550px;">
                    <span style="margin-bottom:5px; display:block; height:25px;">@error.Value</span>
                </div>
                }
            }
        }

Rather than displaying the error itself, I keep getting System.Web.Mvc.ValueProviderResult. I know this is all wrong, and eventually I would want to filter the model state errors into a dictionary inside the TempData but for now I just want to have the error string displayed in the view.

P.S: I've tried to do it manually without the MvcContrib attribute, and I got the same result. But I do prefer to use my own code so I could have more control over the whole issue.

Any suggestions?