Using Areas in ASP.NET MVC Application


ASP.NET MVC relies on certain folder and class naming conventions to organize models, views and controllers. A large application often consists of functionally independent modules with the result that the main application is essentially a bundle of these sub-applications. In such cases, organizing various models, views and controllers can be tedious. Luckily, ASP.NET MVC allows you to split your application into what is known as Areas. Each area mimics the folder structure and conventions as required by ASP.NET MVC. This article shows you how Areas are used in an ASP.NET MVC application.

What are Areas?

Areas are functionally independent modules of your ASP.NET MVC application that mimic the folder structure and conventions of MVC. Consider the following scenario :

Areas are independent modules of your ASP.NET MVC application
Figure 1: Areas are independent modules of your ASP.NET MVC application

As you can see the main application has three functionally independent modules viz. Blog, Help Desk and Shopping. Without any areas in place, you would have put all the controllers and views in the respective folder of the main application folder. Obviously, you cannot have the same controller name for different modules. For example, you cannot have HomeController for Blog and HomeController for HelpDesk. You either need to put all action methods of both the modules in a single controller or create two controllers with altogether different names (say BlogHomeController and HelpDeskHomeController).

With areas in place, each module replicates the MVC folder structure. For example, each module will have its own Models, Views and Controllers folder. You can then have HomeController class in Blog module as well as HelpDesk module. So, in the above example, essentially you will have four MVC structures - one for the main application and one each for the three modules (Blog, HelpDesk and Shopping).

Adding a New Area

Before you work with areas, create a new ASP.NET MVC application with ASPX view engine. To add a new area right click on the application in the Solution Explorer and select the Add > Area shortcut menu option. Doing so will open "Add Area" dialog as shown below:

Adding a New Area
Figure 2: Adding a New Area

You need to enter the Area Name and click the Add button to create the folder structure for that area. The following figure shows the complete folder structure with three Areas - Blog, HelpDesk and Shopping - added.

Solution Explorer
Figure 3: Solution Explorer

As you can see, the main application has Areas subfolders. Inside the Areas subfolders there is a folder for each area you wish to create (Blog, HelpDesk and Shpping in the above example). Each Areaa subfolder has its own set of MVC folders (Models, Views and Controllers). You can treat each area just like the main application and add models, views and controllers in the respective folders.

Registering Areas with MVC Framework

Simply creating area folder structure is not sufficient, you also need to inform ASP.NET MVC framework about the areas you've added. Luckily, this task is automatically done when you add a new area. Notice the area registration class file that was created under each area folder (BlogAreaRegistration.cs, HelpDeskAreaRegistration.cs, etc.). The area registration file contains a class that inherits from AreaRegistration base class. The HelpDeskAreaRegistration class is shown below :

public class HelpDeskAreaRegistration : AreaRegistration
    public override string AreaName
            return "HelpDesk";
    public override void RegisterArea(AreaRegistrationContext context)
            new { action = "Index", id = UrlParameter.Optional }

As you can see the HelpDeskAreaRegistration class overrides AreaName property and the RegisterArea method. The RegisterArea method registers the route information for the newly added area with MVC framework.

You will have one area registration class file for each area. When are the area registration classes used? If you open Global.asax file, you will have the following code in the Application_Start event handler :

protected void Application_Start()

As you can see, there is a call to RegisterAllAreas() static method of AreaRegistration class. Calling RegisterAllAreas() method in turn invokes the RegisterArea() method of all the area registration classes found in the application.

Before going ahead, add HomeController to all the areas and the main application, i.e. four controller classes with name HomeController. All the HomeController classes will look like this :

public class HomeController : Controller
    public ActionResult Index()
        return View();

Then right click on each Index() action method and add Index view, i.e. total four Index views in their respective folders.

Run the application and try navigating to different areas. The following figure shows a sample run for HelpDesk area. Notice the URL of the area.

Run the Application
Figure 4: Run the Application

Linking Between Two Areas

ASP.NET MVC Views often need to link to some action method residing in controller classes. Unless otherwise specified, action methods and controllers are assumed to be from the current area. In case you wish to link to an action method belonging to some other area, here is how you would do just that:

<h3>You are inside main area. To navigate to some other area please click on the following links</h3>
<%= Html.ActionLink("Main Area", "Index", "Home", new { area = "" }, null)%>
<br /><br />
<%= Html.ActionLink("Blog Area", "Index", "Home", new { area = "Blog" }, null)%>
<br /><br />
<%= Html.ActionLink("Help Desk Area", "Index", "Home", new { area = "HelpDesk" }, null)%>
<br /><br />
<%= Html.ActionLink("Shopping Area", "Index", "Home", new { area = "Shopping" }, null)%>

The above fragment is from the Index view of the main area. It renders four hyperlinks using ActionLink(). Notice the fourth parameter that specifies area name. This parameter governs the area whose action method is being linked to.

Redirecting to an Action Belonging to Another Area

You can also redirect to some action method of a specific area using RedirectToAction() method. Consider the following action method:

public ActionResult Index()
    return RedirectToAction("Index", "Home", new { Area = "HelpDesk" });

As you can see, the Index() action method of the main area redirects the control to Index() action method of the HelpDesk area.


ASP.NET MVC allows you to organize your application into areas. Each area replicates the MVC structure and can be treated as independent as far as models, views and controllers are concerned. An area is registered with MVC framework using an area registration class and RegisterAllAreas() call in the Global.asax file.

About the Author

Bipin Joshi

Bipin Joshi is a blogger and writes about apparently unrelated topics - Yoga & technology! A former Software Consultant by profession, Bipin has been programming since 1995 and has been working with the .NET framework ever since its inception. He has authored or co-authored half a dozen books and numerous articles on .NET technologies. He has also penned a few books on Yoga. He was a well known technology author, trainer and an active member of Microsoft developer community before he decided to take a backseat from the mainstream IT circle and dedicate himself completely to spiritual path. Having embraced Yoga way of life he now codes for fun and writes on his blogs. He can also be reached there.



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