NetEase Frequently Asked ASP.NET MVC Interview Questions Answers

How to enable Attribute Routing?

Just add the method — “MapMvcAttributeRoutes()” to enable attribute routing as shown below

public static void RegistearRoutes(RouteCollection routes)

{

routes.IgnoareRoute(“{resource}.axd/{*pathInfo}”);

//enabling attribute routing

routes.MapMvcAttributeRoutes();

//convention-based routing

routes.MapRoute

(

name: “Default”,

url: “{controller}/{action}/{id}”,

defaults: new { controller = “Customer”, action = “GetCustomerList”, id = UrlParameter.Optional }

);

}

Can you explain Model, Controller and View in MVC?

Model — It’s a business entity and it is used to represent the application data.

Controller — Request sent by the user always scatters through controller and it’s responsibility is to redirect to the specific view using View() method.

View — It’s the presentation layer of MVC.

Explain the new features added in version 4 of MVC (MVC4)?

Following are features added newly –

→Asynchronous controller task support.

→Bundling the java scripts.

→Segregating the configs for MVC routing, Web API, Bundle etc.

→Mobile templates

→Added ASP.NET Web API template for creating REST based services.

→Asynchronous controller task support.

→Bundling the java scripts.

→Segregating the configs for MVC routing, Web API, Bundle etc.

NetEase Frequently Asked ASP.NET MVC Interview Questions Answers

Can you explain the page life cycle of MVC?

Below are the processed followed in the sequence -

→App initialization

→Routing

→Instantiate and execute controller

→Locate and invoke controller action

→Instantiate and render view.

What are the advantages of MVC over ASP.NET?

→Provides a clean separation of concerns among UI (Presentation layer), model (Transfer objects/Domain Objects/Entities) and Business Logic (Controller).

→Easy to UNIT Test.

→Improved reusability of model and views. We can have multiple views which can point to the same model and vice versa.

→Improved structuring of the code.

What is Separation of Concerns in ASP.NET MVC?

It’s is the process of breaking the program into various distinct features which overlaps in functionality as little as possible. MVC pattern concerns on separating the content from presentation and data-processing from content.

How we can add the CSS in MVC?

Below is the sample code snippet to add css to razor views –

<link rel=”StyleSheet” href=”/@Href(~Content/Site.css”)” type=”text/css”/>

Can I add MVC Testcases in Visual Studio Express?

No. We cannot add the test cases in Visual Studio Express edition it can be added only in Professional and Ultimate versions of Visual Studio.

What is the use .Glimpse in MVC?

Glimpse is an open source tool for debugging the routes in MVC. It is the client side debugger. Glimpse has to be turned on by visiting to local url link -

http://localhost:portname//glimpse.axd

This is a popular and useful tool for debugging which tracks the speed details, url details etc.

What is RouteConfig.cs in MVC 4?

“RouteConfig.cs” holds the routing configuration for MVC. RouteConfig will be initialized on Application_Start event registered in Global.asax.

What are Scaffold templates in MVC?

Scaffolding in ASP.NET MVC is used to generate the Controllers,Model and Views for create, read, update, and delete (CRUD) functionality in an application. The scaffolding will be knowing the naming conventions used for models and controllers and views.

Explain the types of Scaffoldings.

Below are the types of scaffoldings –

Empty

Create

Delete

Details

Edit

List

Can a view be shared across multiple controllers? If Yes, How we can do that?

Yes, we can share a view across multiple controllers. We can put the view in the “Shared” folder. When we create a new MVC Project we can see the Layout page will be added in the shared folder, which is because it is used by multiple child pages.

What is the difference between ViewBag and ViewData in MVC?

ViewBag is a wrapper around ViewData, which allows to create dynamic properties. Advantage of viewbag over viewdata will be –

In ViewBag no need to typecast the objects as in ViewData.

ViewBag will take advantage of dynamic keyword which is introduced in version 4.0. But before using ViewBag we have to keep in mind that ViewBag is slower than ViewData.

Explain TempData in MVC?

TempData is again a key, value pair as ViewData. This is derived from “TempDataDictionary” class. TempData is used when the data is to be used in two consecutive requests, this could be between the actions or between the controllers. This requires typecasting in view.

What are HTML Helpers in MVC?

HTML Helpers are like controls in traditional web forms. But HTML helpers are more lightweight compared to web controls as it does not hold viewstate and events.

HTML Helpers returns the HTML string which can be directly rendered to HTML page. Custom HTML Helpers also can be created by overriding “HtmlHelper” class.

What are AJAX Helpers in MVC?

AJAX Helpers are used to create AJAX enabled elements like as Ajax enabled forms and links which performs the request asynchronously and these are extension methods of AJAXHelper class which exists in namespace — System.Web.Mvc.

What are the options can be configured in AJAX helpers?

Below are the options in AJAX helpers –

Url — This is the request URL.

Confirm — This is used to specify the message which is to be displayed in confirm box.

OnBegin — Javascript method name to be given here and this will be called before the AJAX request.

OnComplete — Javascript method name to be given here and this will be called at the end of AJAX request.

OnSuccess — Javascript method name to be given here and this will be called when AJAX request is successful.

OnFailure — Javascript method name to be given here and this will be called when AJAX request is failed.

UpdateTargetId — Target element which is populated from the action returning HTML.

Explain JSON Binding?

JavaScript Object Notation (JSON) binding support started from MVC3 onwards via the new JsonValueProviderFactory, which allows the action methods to accept and model-bind data in JSON format. This is useful in Ajax scenarios like client templates and data binding that need to post data back to the server.

Explain Dependency Resolution?

Dependency Resolver again has been introduced in MVC3 and it is greatly simplified the use of dependency injection in your applications. This turn to be easier and useful for decoupling the application components and making them easier to test and more configurable.

Explain Bundle.Config in MVC5?

“BundleConfig.cs” in MVC5 is used to register the bundles by the bundling and minification system. Many bundles are added by default including jQuery libraries like — jquery.validate, Modernizr, and default CSS references.

How route table has been created in ASP.NET MVC?

Method — “RegisterRoutes()” is used for registering the routes which will be added in “Application_Start()” method of global.asax file, which is fired when the application is loaded or started.

Which are the important namespaces used in MVC?

Below are the important namespaces used in MVC -

System.Web.Mvc

System.Web.Mvc.Ajax

System.Web.Mvc.Html

System.Web.Mvc.Async

What is ViewData?

Viewdata contains the key, value pairs as dictionary and this is derived from class — “ViewDataDictionary“. In action method we are setting the value for viewdata and in view the value will be fetched by typecasting.

What is Layout in MVC?

Layout pages are similar to master pages in traditional web forms. This is used to set the common look across multiple pages. In each child page we can find — /p>

@{

Layout = “~/Views/Shared/TestLayout1.cshtml”;

}

This indicates child page uses TestLayout page as it’s master page.

Explain Sections is MVC?

Section are the part of HTML which is to be rendered in layout page. In Layout page we will use the below syntax for rendering the HTML –

@RenderSection(“TestSection”)

And in child pages we are defining these sections as shown below –

@section TestSection{

<h1>Test Content</h1>

}

If any child page does not have this section defined then error will be thrown so to avoid that we can render the HTML like this –

@RenderSection(“TestSection”, required: false)

What are Code Blocks in Views?

Unlike code expressions that are evaluated and sent to the response, it is the blocks of code that are executed. This is useful for declaring variables which we may be required to be used later.

@{

int x = 123;

string y = “aa”;

}

What is the “HelperPage.IsAjax” Property?

The HelperPage.IsAjax property gets a value that indicates whether Ajax is being used during the request of the Web page.

How we can call a JavaScript function on the change of a Dropdown List in MVC?

Create a JavaScript method:

<script type=”text/javascript”>

function DrpIndexChanged() { }

</script>

Invoke the method:

<%:Html.DropDownListFor(x => x.SelectedProduct, new SelectList(Model.Customers, “Value”, “Text”), “Please Select a Customer”, new { id = “ddlCustomers”, onchange=” DrpIndexChanged ()” })%>