How to consume WCF service to MVC .

private string BASE_URL = "http://localhost:24491/ServiceProduct.svc/";
        public List<Product> findall()
        {
            try {
                var wc = new WebClient();
             
                var json = wc.DownloadString(BASE_URL + "findall");
                var js = new JavaScriptSerializer();
                 
                return js.Deserialize<List <Product>>(json);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

Invalid JSON primitive: .