ASP.Net MVC Overview

The Model-View-Controller (MVC) architectural pattern separates an application into three main components: the model, the view, and the controller. The ASP.NET MVC framework provides an alternative to the ASP.NET Web Forms pattern for creating MVC-based Web applications. The ASP.NET MVC framework is a lightweight, highly testable presentation framework that (as with Web Forms-based applications) is integrated with existing ASP.NET features, such as master pages and membership-based authentication. The MVC framework is defined in the System.Web.Mvc namespace and is a fundamental, supported part of the System.Web namespace.

MVC is a standard design pattern that many developers are familiar with. Some types of Web applications will benefit from the MVC framework. Others will continue to use the traditional ASP.NET application pattern that is based on Web Forms and postbacks. Other types of Web applications will combine the two approaches; neither approach excludes the other.

The MVC framework includes the following components:

Model: MVC model is basically a C# or VB.NET class. A model is accessible by both controller and view. A model can be used to pass data from controller to view. A view can use model to display data in page.

View: View is an ASPX page without having a code behind file. All page specific HTML generation and formatting can be done inside view. We can use inline code (server tags) to develop dynamic pages. A request to view (ASPX page) can be made only from a controller’s action method.

Controller: Controller is basically a C# or VB.NET class which inherits System.Mvc.Controller. Controller is a heart of the entire MVC architecture. Inside Controller’s class action methods can be implemented which are responsible for responding to browser OR calling views. Controller can access and use model class to pass data to views. Controller uses ViewData to pass any data to view.

The MVC pattern helps you create applications that separate the different aspects of the application (input logic, business logic, and UI logic), while providing a loose coupling between these elements. The pattern specifies where each kind of logic should be located in the application. The UI logic belongs in the view. Input logic belongs in the controller. Business logic belongs in the model. This separation helps you manage complexity when you build an application, because it enables you to focus on one aspect of the implementation at a time. For example, you can focus on the view without depending on the business logic.

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