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copied!<p>There is something wrong here:</p> <pre><code> var onlineid = db.OApply.Where(x => x.OAId == Id).FirstOrDefault(); -> Mapper.Map<OApplyIDViewModel,OApply>(oapply); oapply.UDateBy = Membership.GetUser().ProviderUserKey.ToString(); oapply.UDate = DateTime.Now; db.Entry(onlineid).State= EntityState.Modified; </code></pre> <p>The line with the arrow returns a new <code>OApply</code> instance. It does not update <code>onlineid</code>. In fact, it has no idea about <code>onlineid</code>. Try the following.</p> <pre><code>Mapper.Map<OApplyIDViewModel,OApply>(oapply, onlineid); </code></pre> <p>Now it will modify <code>onlineid</code> instead of returning one. However, you should ignore the mapping for the primary key if it is an <code>identity</code> (auto-incrementing) one.</p> <pre><code>AutoMapper.Mapper.CreateMap<OApplyIDViewModel, OApply>() .ForMember(dest => dest.OAId, opt => opt.Ignore()); </code></pre> <p>I am not sure if <code>OAId</code> is your primary key or not. You are not following naming conventions and probably some other conventions too, at all.</p> <hr> <p>I have made corrections in your code :</p> <pre><code>public ActionResult ClientEditID(int id) { OApply oapply = db.OApply.Find(id); ->if (oapply == null ) { return HttpNotFound(); } ->var model = Mapper.Map<OApply, OApplyIDViewModel>(oapply); ViewBag.CountryId = new SelectList(db.Countries, "CountryId", "CountryName", model.CountryId); ViewBag.IdId = new SelectList(db.PhotoIds, "IdId", "IdName", model.IdId); ->return View(model); } </code></pre> <p>Your <code>HttpPost</code> is mostly valid, except that you put data into <code>ViewBag</code> before you use <code>RedirectToAction()</code>. That data will be lost. Instead, use <code>TempData</code> dictionary. Check msdn. </p>

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