I am explain about interview question of dot net. I attend multiple interview where interviewer ask question to me. Here I am a question with answer of the question.

Q : What is Postback? Why we use it ?

Ans. Postback we use send data request to server.

Q : Tell about Viewstate ?

Ans. Viewstate maintains the Postback.

Q: Define the default session timeout?

Ans. I told him the default session timeout is 20 min.

Q: Where need to use Interface and abstract class? Difference some between both ?

Ans. Interface class we use that we didn’t about implement we just have requirement specification. As Abstract class we know about implementation but half implementation not complete then we use each both.

1      1)    Interface we declare the variable with initialization but Abstract not restriction of initialization without initialization we declare a variable.

2      2)    Construction are not allow in interface class. Abstract class full support construction concept.

Q: What is a difference between encapsulation and abstraction ?

Encapsulation :

Encapsulation class hiding the complexity. Private the code didn’t show actually what user  need they don’t the behind of the application. Actually implement the abstraction class.

Abstraction:

Abstraction class showing the necessary in the designing side what user want in front side. Abstraction class are modeling.

Overloading method :

Overloading means two method  name are same but different number of Parameters and Signature.

Overriding Method :

Overriding means same the name of parent class method name also same the child class method name but child full they to redefine parent class method.

Q: Why we use Polymorphism and what the type of that ?

Ans. Polymorphism are inherit multiple we call it at different place where are they need.

Type of Polymorphism :

Static  Polymorphism  (also called Overloading method)

Dynamic  Polymorphism(Also called overriding method)

Q : Tell about ViewBag, ViewData, TempData and also in MVC ?

ViewBag :

ViewBag are the collection of ViewData. It is dynamically take value and also send data controller to View.  We without declare with parameters of square bracket example below.

ViewBag.testdata = “ This is test data”;

ViewData :

ViewData is also send data controller to view but it is static. We declare it with square bracket parameter example below.

ViewData[“testdata”] = “This is test data”;

TempData :

Tempdata data send controller to controller not in View. It is also declare of same of ViewData like Square parameters. Example below

TempData[“testdata”] = “this is test data”;

Session Variable :

Session Variable we use every where like view to controller and controller to controller.

Q: Explain between Get and Post in asp.net ?

Get :

Get send the data to http but it is not secure. Get value show in the address Url. It is benefit in SEO.

Post:

Post also send data to http for submitting but it secure. We don’t see the value of Post in Url of the browser.

Q: Can we use ViewState in Asp.net MVC in Asp.net ?

Ans. No Asp.net MVC not Supported ViewState.

Q: Asp.net C# support multiples Inheritance?

Ans. No C# didn’t supported multiples inheritance.