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    copied!<p>In your View I don't see any text box or a field allowing to send data to the controller, only a label. Properties will <a href="http://bradwilson.typepad.com/blog/2010/01/input-validation-vs-model-validation-in-aspnet-mvc.html" rel="nofollow noreferrer">not be validated if they are not posted</a>. Add a textbox, leave it blank and your model won't be valid any more:</p> <pre><code>&lt;%= Html.TextBoxFor(m =&gt; m.Customer.Name.Title)%&gt; </code></pre> <hr> <p>UPDATE:</p> <p>Here's the code I've used:</p> <p>Model:</p> <pre><code>public class Name { [StringLength(10), Required] public virtual string Title { get; set; } } public class Customer { public virtual Name Name { get; set; } } public class CustomerViewModel { public Customer Customer { get; set; } } </code></pre> <p>Controller:</p> <pre><code>public class HomeController : Controller { public ActionResult Index() { return View(); } [HttpPost] public ActionResult Index([Bind(Prefix = "Customer")]Customer cs) { return View(new CustomerViewModel { Customer = cs }); } } </code></pre> <p>View:</p> <pre><code>&lt;%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage&lt;MyApp.Models.CustomerViewModel&gt;" %&gt; &lt;asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"&gt; &lt;% using(Html.BeginForm()) { %&gt; &lt;%= Html.LabelFor(m =&gt; m.Customer.Name.Title)%&gt; &lt;%= Html.TextBoxFor(m =&gt; m.Customer.Name.Title)%&gt; &lt;button type="submit"&gt;Submit&lt;/button&gt; &lt;% } %&gt; &lt;/asp:Content&gt; </code></pre> <p>When you submit this form a validation error is shown.</p> <p>Remark1: I've omitted the <code>Entity</code> base class in the models as I don't how does it look.</p> <p>Remark2: I've renamed the variable in the Index action to <code>cs</code>. I remember that there was some problems with this in ASP.NET MVC 1.0 when you had the prefix and the variable named the same but I am not sure whether this applies here and I think it was fixed.</p>
 

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