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copied!<p>You are using </p> <blockquote> <p>Html.RenderAction</p> </blockquote> <p>so rather try</p> <pre><code>public ActionResult Menu(string category = null) { // Your controller code. return View(categories); } </code></pre> <p>instead of</p> <pre><code>public PartialViewResult Menu(string category = null) { // Your controller code. return PartialView(categories); } </code></pre> <p>it also looks like you are missing your default route mapping</p> <pre><code>routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "[Your default controller name goes here]", action = "[Your default action name goes here]", id = UrlParameter.Optional} ); </code></pre> <p><strong>Update</strong></p> <p>I don't know if all those routing rules that is specified in your RouteConfig.cs file is needed. Keep it as simple as possible, for example</p> <pre><code>public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Login", action = "Index", id = UrlParameter.Optional } ); } </code></pre> <p><strong>Update</strong></p> <p>Your Menu action is expecting a category parameter, so you will have to pass it one, or setup a proper route mapping. So change</p> <pre><code>@{ Html.RenderAction("Menu", "Nav"); } </code></pre> <p>to</p> <pre><code>@{ Html.RenderAction("Menu", "Nav", new {category = null}); } </code></pre>

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