ASP.NET MVC Interview Questions: Part 1

Initially I will focus on ASP.NET MVC interview questions and here are few of them starting from today. In upcoming articles, I will keep on adding fresh questions and intent will be to cover up all those scenarios which you may encounter in an interview. Here we go,

Question: Suppose you want to use a partial view but also pass the same model object from the parent view, what HTML Helper would you use?

Answer: Html.Partial() method provide by MVC.

Question: How can we create a dynamically generated form for an entire object based upon the metadata of the object's type using MVC engine.

Answer: We can use Html.EditorForModel() for this purpose, then we do not need to pass the model to the helper as a parameter because it reads directly from the view. For more deep understanding you can go through the following images:



Output after rendering.



Question: What is the use of OutputCacheAttribute in MVC?

Answer: The best use of this attribute is to mark an action method whose output will be cached.

Question: You have restricted a Controller so that all actions require the user to be authorized. Now an unauthorized user want to access a specific action so what will be your approach in order to use without authorization?

Answer: You should decorate that particular action with AllowAnonymous attribute.

1. MVC provides clean separation of concerns (SoC).
2. MVC allows full control over the rendered HTML you can do amendments as your need.
3. Enable Test Driven Development (TDD) and easy to test.
4. Easy integration with JavaScript frameworks which enables rich features.
5. Support third-party view engines.No ViewState and PostBack events so it is stateless nature of web.
6. URL based approach which is famous as Routing.

Advantages of Web Form Model

1. Provides Rapid action development.
2. Provides rich controls.Easy development model and event driven.
3. Familiar model for windows form developers.

To explore MVC further, I am sharing some interesting facts about the similarities and dissimilarities of MVC and Web Forms.

I have seen many articles stating dissimilarities between both, however I will also list some similarities.

ASP.NET MVC / Web Forms Similarities

The following are some similarities; they both:

1. Are built on the ASP.Net Framework.
2. Are in the System.Web namespace.
3. Use .Net Framework supported languages.
4. Use an IIS and ASP.Net request Pipeline, for example HTTP Handler and HTTP Module.
5. Send the response back to the client in the form of HTML.
6. Also support third-party controls.

ASP.NET MVC / Web Forms dissimilarities

The following are some dissimilarities.

I hope these facts may help you to understand the similarities and dissimilarities between MVC and Web Forms. I tried to keep it simple to understand the fact in an easier manner.

Question: TempData, Keep and Peek methods in MVC4 and its uses practically.

Answer: An intention to write something on these keywords Keep and Peek to abolish confusion. Here are the definition of Keep and Peek method:

• Keep-> It marks the specified keys to keep in dictionary memory.
  
• Peek-> it returns an object contains an element without marking object for deletion in Dictionary.

Let’s look at a practical approach and abolish confusion if someone has. TempData value persist at successive request and can transmit from Controller to View. After transferring TempData value from controller to View, if you again try to use it at other level than it will lost its value and become null. TempData is used to pass data from current request to subsequent request from one level to another level e.g. controller to view, controller to controller. One action to another action. I’ve two action methods of a same controller and performed some steps in order to verify the authenticity of methods.