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copied!<p>Solved it!</p> <p>If anyone is interested, my solution is the following. I created a class:</p> <pre><code>public class AttributeEditViewModel { public AttributeEditViewModel() { } public AttributeEditViewModel(Attribute attribute, SelectList categories) { this.attribute = attribute; this.categories = categories; } public Attribute attribute { get; set; } public SelectList categories { get; set; } } </code></pre> <p>My controller:</p> <pre><code> // GET: /Attribute/Edit/5 public ActionResult Edit(int AttributeID) { Attribute _attribute = ProfileDB.GetAttribute(AttributeID); var _viewmodel = new AttributeEditViewModel { attribute = _attribute, categories = new SelectList(ProfileDB.GetAllCategories(), "CategoryID", "CategoryName", _attribute.CategoryID) }; return View(_viewmodel); } </code></pre> <p>Part of my view:</p> <pre><code><%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<KnowledgePortal.ViewModel.AttributeEditViewModel>" %> <div class="editor-field"> <%: Html.DropDownList("Category", Model.categories, Model.attribute.CategoryID) %> </div> <p> <input type="submit" value="Save" /> </p> </code></pre> <p>And the postback:</p> <pre><code>// POST: /Attribute/Edit/5 [HttpPost] public ActionResult Edit(int AttributeID, FormCollection formcollection) { var _attribute = ProfileDB.GetAttribute(AttributeID); int _selcategory = Convert.ToInt32(formcollection["Category"]); _attribute.CategoryID = (int)_selcategory; try { ProfileDB.SaveChanges(); return RedirectToAction("Index"); } catch (Exception e) { return View(_attribute); } } </code></pre> <p>Basically my problem was due to my lack of understanding what updatemodel did. So after "_attribute.CategoryID = _selcategory" all I had to do was savechanges, but first I tried to updatemodel which kept failing.</p> <p>Hope this helps someone else!</p>

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