PricewaterhouseCoopers Most Frequently Asked ASP.NET MVC Interview Questions Answers
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.
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.
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.
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.
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| PricewaterhouseCoopers Most Frequently Asked ASP.NET MVC Interview Questions Answers |
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.
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