ASP.NET MVC 3 Interview Questions

What is MVC?

MVC is a framework methodology that divides an application’s implementation into three component roles: models, views, and controllers.

“Models” in a MVC based application are the components of the application that are responsible for maintaining state. Often this state is persisted inside a database (for example: we might have a Product class that is used to represent order data from the Products table inside SQL).
“Views” in a MVC based application are the components responsible for displaying the application’s user interface. Typically this UI is created off of the model data (for example: we might create an Product “Edit” view that surfaces textboxes, dropdowns and checkboxes based on the current state of a Product object).
“Controllers” in a MVC based application are the components responsible for handling end user interaction, manipulating the model, and ultimately choosing a view to render to display UI. In a MVC application the view is only about displaying information – it is the controller that handles and responds to user input and interaction.

Which are the advantages of using MVC Framework?

MVC is one of the most used architecture pattern in ASP.NET and this is one of those ASP.NET interview question to test that do you really understand the importance of model view controller.
1. It provides a clean separation of concerns between UI and model.
2. UI can be unit test thus automating UI testing.
3. Better reuse of views and model. You can have multiple views which can point to the same model and also vice versa.
4. Code is better organized.

What is Razor View Engine?

Razor view engine is a new view engine created with ASP.Net MVC model using specially designed Razor parser to render the HTML out of dynamic server side code. It allows us to write Compact, Expressive, Clean and Fluid code with new syntaxes to include server side code in to HTML.

What is namespace of asp.net mvc?

ASP.NET MVC namespaces and classes are located in the System.Web.Mvc assembly.

System.Web.Mvc namespace
Contains classes and interfaces that support the MVC pattern for ASP.NET Web applications. This namespace includes classes that represent controllers, controller factories, action results, views, partial views, and model binders.

System.Web.Mvc.Ajax namespace
Contains classes that support Ajax scripts in an ASP.NET MVC application. The namespace includes support for Ajax scripts and Ajax option settings.

System.Web.Mvc.Async namespace
Contains classes and interfaces that support asynchronous actions in an ASP.NET MVC application

System.Web.Mvc.Html namespace
Contains classes that help render HTML controls in an MVC application. The namespace includes classes that support forms, input controls, links, partial views, and validation.

How to identify AJAX request with C# in MVC.NET?

The solution is in depended from MVC.NET framework and universal across server-side technologies. Most modern AJAX applications utilize XmlHTTPRequest to send async request to the server. Such requests will have distinct request header:

X-Requested-With = XMLHTTPREQUEST

AJAX GET Request

MVC.NET provides helper function to check for ajax requests which internally inspects X-Requested-With request header to set IsAjax flag.

HelperPage.IsAjax Property
Gets a value that indicates whether Ajax is being used during the request of the Web page.

Namespace: System.Web.WebPages
Assembly: System.Web.WebPages.dll

However, same can be achieved by checking requests header directly:

Request[“X-Requested-With”] == “XmlHttpRequest”

What is Repository Pattern in ASP.NET MVC?

Repository pattern is useful for decoupling entity operations form presentation, which allows easy mocking and unit testing.

“The Repository will delegate to the appropriate infrastructure services to get the job done. Encapsulating in the mechanisms of storage, retrieval and query is the most basic feature of a Repository implementation”

“Most common queries should also be hard coded to the Repositories as methods.”

Which MVC.NET to implement repository pattern Controller would have 2 constructors on parameterless for framework to call, and the second one which takes repository as an input:

class myController: Controller
{
    private IMyRepository repository;
    
    // overloaded constructor
    public myController(IMyRepository repository)  
    {
        this.repository = repository;
    }

    // default constructor for framework to call
    public myController() 
    {
        //concreate implementation
        myController(new someRepository()); 
    }
...

    public ActionResult Load()
    {
        // loading data from repository
        var myData = repository.Load(); 
    }
}

What is difference between MVC(Model-View-Controller) and MVP(Model-View-Presenter)?

The main difference between the two is how the manager (controller/presenter) sits in the overall architecture.

All requests goes first to the Controller
MVC pattern puts the controller as the main ‘guy’ in charge for running the show. All application request comes through straight to the controller, and it will decide what to do with the request.

Giving this level of authority to the controller isn’t an easy task in most cases. Users interaction in an application happen most of the time on the View.

Thus to adopt MVC pattern in a web application, for example, the url need to become a way of instantiating a specific controller, rather than ‘simply’ finding the right View (webform/ html page) to render out. Every requests need to trigger the instantiation of a controller which will eventually produce a response to the user.

This is the reason why it’s alot more difficult to implement pure MVC using Asp.Net Webform. The Url routing system in Asp.Net webform by default is tied in to the server filesystem or IIS virtual directory structure. Each of these aspx files are essentially Views which will always get called and instantiated first before any other classes in the project. (Of course I’m overgeneralizing here. Classes like IHttpModule, IHttpHandler and Global.asax would be instantiated first before the aspx web form pages).

MVP (Supervising Controller) on the other hand, doesn’t mind for the View to take on a bigger role. View is the first object instantiated in the execution pipeline, which then responsible for passing any events that happens on itself to the Presenter.

The presenter then fetch the Models, and pass it back to the view for rendering.

For more detailed answer see my post MVC Vs MVP.

What is the ‘page lifecycle’ of an ASP.NET MVC?

Following process are performed by ASP.Net MVC page:
1) App initialization
2) Routing
3) Instantiate and execute controller
4) Locate and invoke controller action
5) Instantiate and render view

How to call javascript function on the change of Dropdown List in ASP.NET MVC?

Create a java-script function:

<script type="text/javascript">
            function selectedIndexChanged() {
            }
</script>

Call the function:

<%:Html.DropDownListFor(x => x.SelectedProduct, 
new SelectList(Model.Products, "Value", "Text"),
"Please Select a product", new { id = "dropDown1", 
onchange="selectedIndexChanged()" })%> 

How route table is created in ASP.NET MVC?

When an MVC application first starts, the Application_Start() method is called. This method, in turn, calls the RegisterRoutes() method. The RegisterRoutes() method creates the route table.

How do you avoid XSS Vulnerabilities in ASP.NET MVC?

Use the syntax <%: %> in ASP.NET MVC instead of using <%= %> .net framework 4.0.
You can also use Anti-XSS library as a default encoding engine for ASP.NET MVC.

Explain how to access Viewstate values of this page in the next page?

PreviousPage property is set to the page property of the nest page to access the viewstate value of the page in the next page.

Page poster = this.PreviousPage;

Once that is done, a control can be found from the previous page and its state can be read.

Label posterLabel = poster.findControl("myLabel");
 string lbl = posterLabel.Text;

How to create dynamic property with the help of viewbag in ASP.NET MVC?

You can directly assign some key name with syntax ViewBag.[KeyName]=[SomeValue] and value using equal to operator.
For example, you need to assign list of countries to the dynamic Countries property of ViewBag.

List<string> countries = new List<string>();
countries.Add("Australia");
countries.Add("UK");
ViewBag.Countries = countries; 
//Countries is dynamic property associated with ViewBag

What is difference between Viewbag and Viewdata in ASP.NET MVC?

The basic difference between ViewData and ViewBag is that in ViewData instead creating dynamic properties we use properties of Model to transport the Model data in View and in ViewBag we can create dynamic properties without using Model data.

What is Routing?

A route is a URL pattern that is mapped to a handler. The handler can be a physical file, such as an .aspx file in a Web Forms application. Routing module is responsible for mapping incoming browser requests to particular MVC controller actions.

Next Articles On ASP.NET MVC Interview Questions
ASP.NET MVC 3 Interview Questions – Deep Dive
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ASP.NET MVC 3 Interview Questions
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19 Comments

  1. Mehul

    its nice ,but can you post more question on this topics for 2-3 experience holder

    Reply

  2. Gibbson

    Good set of questions .
    Nice work!!

    Reply

  3. Anup Munot

    Very nice and usefull questions. Thanks for your efforts.

    Reply

  4. nikit

    Good work, Its really helpful.

    Reply

  5. Gaurang

    Really helpfull

    Reply

  6. Paresh Rathod

    Really useful questions, great effort Jinal!!!

    Reply

  7. MVC Interview Questions - Deep Dive | Jinal Desai

    […] article as PDF For basic Interview Questions of MVC refer my first post of MVC Interview […]

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  8. RK

    Thanks a lot for your effort .Helped me a lot..

    Reply

  9. dotnetter

    A good refresher a clean cut set of questions and answers. Thank you so much!

    Reply

  10. Karthikeyan

    Thanks .. it was useful and in a easy way,,

    Reply

  11. Hemant

    thank you so much for posting such a nice and useful questions. can you please post more questions with answers in asp.net MVC 3?? I will be great thankful to to you if you post more questions.

    Thank you again.

    Reply

  12. DKP

    Thanks for these. Its good.

    Reply

  13. Ghanshyam Singh Tomar

    Nice explanation of facts, you can put some more questions.

    Reply

  14. afazal

    very nice sir…..

    Reply

  15. Shashank

    Awesome questions…
    You hit the correct chords in some of the questions..

    Reply

  16. Ajay Solanki

    Good Explaination!!!!!!!!
    Good Work

    Reply

  17. MVC interview questions | Knowledge Base

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  18. ASP.NET MVC 4 New Features Interview Questions | Jinal Desai .NET

    […] Articles On ASP.NET MVC ASP.NET MVC 3 Interview Questions ASP.NET MVC 3 Interview Questions – Deep […]

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  19. Srichecks

    Great article,Thanks for your post.

    Reply

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