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    <p>If the logic is really simple as you shown above then there is no problem of duplicating the code in JavaScript as done by @Jonas. Sometimes we have to break the rules(DRY) to achieve something that gives a better experience to the user. If you don't duplicate the code then you are making an additional request to the server and the bird will fly away before knowing it's size :)</p> <p>But still if you want to do then..</p> <p><strong>Models</strong></p> <pre><code>public class BirdViewModel { public Bird Bird { get; set; } public IEnumerable&lt;SelectListItem&gt; Heights { get; set; } public IEnumerable&lt;SelectListItem&gt; Weights { get; set; } } public class Bird { public int WeightId { get; set; } public int HeightId { get; set; } public string Weight { get; set; } public string Height { get; set; } public string BirdSize { get { if (HeightId == 3 &amp;&amp; WeightId == 3) { return "Big"; } else { return "Small"; } } } } </code></pre> <p><strong>Controller</strong></p> <pre><code>public class BirdController : Controller { public ActionResult Index() { var model = new BirdViewModel(); model.Weights = new[] { new SelectListItem{ Text = "Light", Value = "1" }, new SelectListItem{ Text = "Medium", Value = "2" }, new SelectListItem{ Text = "Heavy", Value = "3" } }; model.Heights = new[] { new SelectListItem{ Text = "Short", Value = "1" }, new SelectListItem{ Text = "Medium", Value = "2" }, new SelectListItem{ Text = "Tall", Value = "3" } }; return View(model); } [HttpPost] public PartialViewResult DisplaySize(Bird bird) { return PartialView(bird); } } </code></pre> <p><strong>Index.cshtml</strong></p> <pre><code>@model Birds.Models.BirdViewModel @{ ViewBag.Title = "Index"; var ajaxOptions = new AjaxOptions { UpdateTargetId = "birdSize", Url = "Bird/DisplaySize" }; } &lt;h2&gt;Index&lt;/h2&gt; @using (Ajax.BeginForm(ajaxOptions)) { &lt;h3&gt;Bird Weight&lt;/h3&gt; &lt;div&gt; @Html.DropDownListFor(model =&gt; model.Bird.WeightId, Model.Weights, new { @id = "weightddl" }) &lt;/div&gt; &lt;h3&gt;Bird Height&lt;/h3&gt; &lt;div&gt; @Html.DropDownListFor(model =&gt; model.Bird.HeightId, Model.Heights, new { @id = "heightddl" }) &lt;/div&gt; &lt;h3&gt; Bird Size&lt;/h3&gt; &lt;div id="birdSize"&gt; @Html.Partial("DisplaySize", Model.Bird ?? new Birds.Models.Bird()) &lt;/div&gt; } &lt;script type="text/javascript"&gt; $("select").change(function () { $("form").submit(); }); &lt;/script&gt; </code></pre> <p><strong>DisplaySize.cshtml</strong></p> <pre><code>@model Birds.Models.Bird @Html.DisplayFor(model =&gt; model.BirdSize) </code></pre> <p>I've used <code>Ajax.BeginForm</code> so you have to include the <code>jquery.unobtrusive-ajax.min.js</code> library.</p>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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