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POMVC 4 Optimistic concurrency exception
 

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  1. POMVC 4 Optimistic concurrency exception
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    <p>Having faced this <a href="https://stackoverflow.com/questions/16011151/mvc-4-edit-modal-form-using-bootstrap/16011752?noredirect=1#comment22836840_16011752">issue</a> (I wanted to allow an edit by using a bootstrap modal window, i'm using MVC4 and entity framework), when I want to save my changes, I have this error message since I'm using the modal window : </p> <pre><code>Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries. </code></pre> <p>Here are my actions : </p> <pre><code>[HttpGet] public ActionResult EditPerson(long id) { var person = db.Persons.Single(p =&gt; p.Id_Person == id); ViewBag.Id_ProductPackageCategory = new SelectList(db.ProductPackageCategories, "Id_ProductPackageCategory", "Name", person.Id_ProductPackageCategory); return PartialView("_EditPerson", person); } [HttpPost] public ActionResult EditPerson(Person person) { ViewBag.Id_ProductPackageCategory = new SelectList(db.ProductPackageCategories, "Id_ProductPackageCategory", "Name", person.Id_ProductPackageCategory); if (ModelState.IsValid) { ModelStateDictionary errorDictionary = Validator.isValid(person); if (errorDictionary.Count &gt; 0) { ModelState.Merge(errorDictionary); return View(person); } db.Persons.Attach(person); db.ObjectStateManager.ChangeObjectState(person, EntityState.Modified); db.SaveChanges(); return View("Index"); } return View(person); } </code></pre> <p>My partial view : </p> <pre><code>@model BuSIMaterial.Models.Person &lt;div class="modal-header"&gt; &lt;button type="button" class="close" data-dismiss="modal" aria-hidden="true"&gt;×&lt;/button&gt; &lt;h3 id="myModalLabel"&gt;Edit&lt;/h3&gt; &lt;/div&gt; &lt;div&gt; @using (Ajax.BeginForm("EditPerson", "Person", FormMethod.Post, new AjaxOptions { InsertionMode = InsertionMode.Replace, HttpMethod = "POST", UpdateTargetId = "table" })) { @Html.ValidationSummary() @Html.AntiForgeryToken() &lt;div class="modal-body"&gt; &lt;div class="editor-label"&gt; First name : &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.TextBoxFor(model =&gt; model.FirstName, new { maxlength = 50 }) @Html.ValidationMessageFor(model =&gt; model.FirstName) &lt;/div&gt; &lt;div class="editor-label"&gt; Last name : &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.TextBoxFor(model =&gt; model.LastName, new { maxlength = 50 }) @Html.ValidationMessageFor(model =&gt; model.LastName) &lt;/div&gt; &lt;div class="editor-label"&gt; National number : &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.NumNat, new { maxlength = 11 }) @Html.ValidationMessageFor(model =&gt; model.NumNat) &lt;/div&gt; &lt;div class="editor-label"&gt; Start date : &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.TextBoxFor(model =&gt; model.StartDate, new { @class = "datepicker", @Value = Model.StartDate.ToString("yyyy/MM/dd") }) @Html.ValidationMessageFor(model =&gt; model.StartDate) &lt;/div&gt; &lt;div class="editor-label"&gt; End date : &lt;/div&gt; &lt;div class="editor-field"&gt; @if (Model.EndDate.HasValue) { @Html.TextBoxFor(model =&gt; model.EndDate, new { @class = "datepicker", @Value = Model.EndDate.Value.ToString("yyyy/MM/dd") }) @Html.ValidationMessageFor(model =&gt; model.EndDate) } else { @Html.TextBoxFor(model =&gt; model.EndDate, new { @class = "datepicker" }) @Html.ValidationMessageFor(model =&gt; model.EndDate) } &lt;/div&gt; &lt;div class="editor-label"&gt; Distance House - Work (km) : &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.HouseToWorkKilometers) @Html.ValidationMessageFor(model =&gt; model.HouseToWorkKilometers) &lt;/div&gt; &lt;div class="editor-label"&gt; Category : &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownList("Id_ProductPackageCategory", "Choose one ...") @Html.ValidationMessageFor(model =&gt; model.Id_ProductPackageCategory) &lt;a href="../ProductPackageCategory/Create"&gt; Add a new category?&lt;/a&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; Upgrade? : &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Upgrade) @Html.ValidationMessageFor(model =&gt; model.Upgrade) &lt;/div&gt; &lt;/div&gt; &lt;div class="modal-footer"&gt; &lt;button class="btn btn-inverse" type="submit"&gt;Save&lt;/button&gt; &lt;/div&gt; } </code></pre> <p>Any idea on what's going on? </p>
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    1. COCan you post code for the Person modal?
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