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    <p>Useful info from @Darin Dimitrov that <code>HttpNotFoundResult</code> is actually returning empty result.</p> <p>After some study. The workaround for <strong>MVC 3</strong> here is to derive all <code>HttpNotFoundResult</code>, <code>HttpUnauthorizedResult</code>, <code>HttpStatusCodeResult</code> classes and implement <strong>new</strong> (overriding it) <code>HttpNotFound</code>() method in <code>BaseController</code>.</p> <p>It is best practise to use base Controller so you have 'control' over all derived Controllers.</p> <p>I create new <code>HttpStatusCodeResult</code> class, not to derive from <code>ActionResult</code> but from <code>ViewResult</code> to render the view or any <code>View</code> you want by specifying the <code>ViewName</code> property. I follow the original <code>HttpStatusCodeResult</code> to set the <code>HttpContext.Response.StatusCode</code> and <code>HttpContext.Response.StatusDescription</code> but then <code>base.ExecuteResult(context)</code> will render the suitable view because again I derive from <code>ViewResult</code>. Simple enough is it? Hope this will be implemented in the MVC core.</p> <p>See my <code>BaseController</code> bellow:</p> <pre><code>using System.Web; using System.Web.Mvc; namespace YourNamespace.Controllers { public class BaseController : Controller { public BaseController() { ViewBag.MetaDescription = Settings.metaDescription; ViewBag.MetaKeywords = Settings.metaKeywords; } protected new HttpNotFoundResult HttpNotFound(string statusDescription = null) { return new HttpNotFoundResult(statusDescription); } protected HttpUnauthorizedResult HttpUnauthorized(string statusDescription = null) { return new HttpUnauthorizedResult(statusDescription); } protected class HttpNotFoundResult : HttpStatusCodeResult { public HttpNotFoundResult() : this(null) { } public HttpNotFoundResult(string statusDescription) : base(404, statusDescription) { } } protected class HttpUnauthorizedResult : HttpStatusCodeResult { public HttpUnauthorizedResult(string statusDescription) : base(401, statusDescription) { } } protected class HttpStatusCodeResult : ViewResult { public int StatusCode { get; private set; } public string StatusDescription { get; private set; } public HttpStatusCodeResult(int statusCode) : this(statusCode, null) { } public HttpStatusCodeResult(int statusCode, string statusDescription) { this.StatusCode = statusCode; this.StatusDescription = statusDescription; } public override void ExecuteResult(ControllerContext context) { if (context == null) { throw new ArgumentNullException("context"); } context.HttpContext.Response.StatusCode = this.StatusCode; if (this.StatusDescription != null) { context.HttpContext.Response.StatusDescription = this.StatusDescription; } // 1. Uncomment this to use the existing Error.ascx / Error.cshtml to view as an error or // 2. Uncomment this and change to any custom view and set the name here or simply // 3. (Recommended) Let it commented and the ViewName will be the current controller view action and on your view (or layout view even better) show the @ViewBag.Message to produce an inline message that tell the Not Found or Unauthorized //this.ViewName = "Error"; this.ViewBag.Message = context.HttpContext.Response.StatusDescription; base.ExecuteResult(context); } } } } </code></pre> <p>To use in your action like this:</p> <pre><code>public ActionResult Index() { // Some processing if (...) return HttpNotFound(); // Other processing } </code></pre> <p>And in _Layout.cshtml (like master page)</p> <pre><code>&lt;div class="content"&gt; @if (ViewBag.Message != null) { &lt;div class="inlineMsg"&gt;&lt;p&gt;@ViewBag.Message&lt;/p&gt;&lt;/div&gt; } @RenderBody() &lt;/div&gt; </code></pre> <p>Additionally you can use a custom view like <code>Error.shtml</code> or create new <code>NotFound.cshtml</code> like I commented in the code and you may define a view model for the status description and other explanations.</p>
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