Getting Error: Not all code paths return a value
<p>I am new to mvc C# and am stuck. Please advise on how to fix this. I'm getting the error on Add. When I hover over the red squiggly line it says "Not all code paths return a value"</p>

<pre><code>    public ActionResult Add(ShapeInputModel dto, FormCollection collection)
    {

        var model = new GeoRegions();

        if (TryUpdateModel(model))
        {


            var destinationFolder = Server.MapPath("/App_Data/KML");
            var postedFile = dto.Shape;

            if (postedFile != null)
            {
                var fileName = Path.GetFileName(postedFile.FileName);
                var path = Path.Combine(destinationFolder, fileName);
                postedFile.SaveAs(path);

                //Save to Database
                Db.AddGeoRegions(model);
                return RedirectToAction("Index");

            }

            return View();

        }
    }
</code></pre>
