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Model-View-Controller is a software pattern for achieving isolation between different application components. Its always desirable for software applications (especially web-based applications) that there must be clear separation between business logic and the user interface. We can achieve this requirement by using MVC (Model View Controller) design that makes our application more flexible to change.

ASP.NET MVC is a framework based on MVC (Model View Controller) design pattern for building web applications. Microsoft has released the latest version of this framework as MVC 5 now, with new features and enhancing existing features as well.

Let's understand a bit about MVC i.e. Model, View and Controller.

• Model:- a representation of our data structure in a data source e.g. database.
• View:- a user interface for model that is presented to end-user.
• Controller:- Translating input from a user to an action on model and preparing appropriate view in response.

We will follow below steps to build a simple ASP.NET MVC5 application:

1. Creating MVC5 project in VS 2013
2. Preparing a Model
3. Add a Controller
4. Add simple View

1. Creating MVC5 project in Visual Studio 2013

• Open Visual Studio Express 2013 for Web and create "New Project" as "File --> New Project.
• Choose "ASP.NET Web Application" template as shown in following figure. Name the project as "MyFirstMVC5App", choose location and press "OK" button.

• In next dialog, choose "MVC" as template and again press "OK" button.

• A new ASP.NET MVC 5 project will be created as follows. You can easily find the "Controllers", "Models" and "Views" folder in solution explorer.

2. Preparing a Model

• In order to prepare a model, right click on "Models" folder and choose "Add", then "Class".
• Name the class as "Employee.cs".

 

public class Employee

     {

             public string EmpID { get; set; }

             public string EmpFirstName { get; set; }

             public string EmpLastName { get; set; }

      }

• As we discussed earlier that "Model" is the representation of data structure in our Data Source, so you can assume this "Employee" class represents an Employee table in our database with columns as "EmpID", "EmpFirstName", "EmpLastName" and so on.

Note: In order to keep this ASP.NET MVC5 tutorial simple and straight forward, I am not going to perform any CRUD operation. We will use this Employees.cs class in later articles on this blog.

3. Add a Controller

• To add a controller to our project, right click on "Controllers" folder, choose "Add", then "Controller". 
• From "Add Scaffold" dialog, choose "MVC 5 Controller - Empty" and press "Add" button as follows:

• Name the controller as "EmployeeController" in next dialog and press "Add". A new controller will be added to "Controllers" folder. Controller code generated will be as follows:

  namespace MyFirstMVC5App.Controllers

    {

        public class EmployeeController : Controller

       {

           // GET: /Employee/

           public ActionResult Index()

          {

              return View();

           }

       }

     }

There are few important things need to understand here:

1. EmployeeController inheriting from base Controller class has a method named Index(). This Index() method will be the default method called when accessing this controller as (http://localhost:xxxx/Employee/).
2. In order to generate HTML response, above Index() method uses a view template i.e. represented in code as "return View();"
3. As we create a controller, a new folder will be created under "Views" named as "Employee".

4. Add a View

• Finally for adding a view, right click on newly created "Employee" folder under views, choose "Add", then "MVC 5 View Page (Razor)". Specify the name for the view "Index" as follows:

• A new file with the name "Index.cshtml" will be added under "Views->Employee" folder. I have added meaningful some text to this page as shown in below figure.

 

Now, we are done with creating a simple ASP.NET MVC 5 application. To run the application, click CTRL + F5. Result will be as follows:

Now change the URL in browser from above to http://localhost:11517/Employee/ and press enter, still the output remains the same.Now it will be clear that request actually comes to controller i.e. EmployeeController in our case and controller renders a view (Index.cshtml we created under Views->Employee folder) for us in browser.

In later web development articles, we will try to explore interaction between Model, Controller and Views in more details