Db update Exception was handle by user code

<br />
<br />
public ActionResult Create()<br />
        {<br />
            return View();<br />
        }<br />
<br />
        // POST: authors/Create<br />
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for <br />
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.<br />
        [HttpPost]<br />
        [ValidateAntiForgeryToken]<br />
        public ActionResult Create([Bind(Include = "au_id,au_lname,au_fname,phone,address,city,state,zip,contract")] author author)<br />
        {<br />
            if (ModelState.IsValid)<br />
            {<br />
                db.authors.Add(author);<br />
                db.SaveChanges();<br />
                return RedirectToAction("Index");<br />
            }<br />
<br />
            return View(author);<br />
        }<br />
<br />

<br />
<br />
public ActionResult Delete(string id)<br />
        {<br />
            if (id == null)<br />
            {<br />
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);<br />
            }<br />
            author author = db.authors.Find(id);<br />
            if (author == null)<br />
            {<br />
                return HttpNotFound();<br />
            }<br />
            return View(author);<br />
        }<br />
<br />
        // POST: authors/Delete/5<br />
        [HttpPost, ActionName("Delete")]<br />
        [ValidateAntiForgeryToken]<br />
        public ActionResult DeleteConfirmed(string id)<br />
        {<br />
            author author = db.authors.Find(id);<br />
            db.authors.Remove(author);<br />
            db.SaveChanges();<br />
            return RedirectToAction("Index");<br />
        }<br />
<br />