General .NET Interview Questions

Posted by: Suprotim Agarwal , on 8/12/2007, in Category Interview Questions
Views: 673984
Abstract: The General .NET Interview Questions consists the most frequently asked questions in .NET. This list of 100+ questions guage your familiarity with the .NET platform. The q&a have been collected over a period of time using MSDN and other similar sites.
What is an application server?
As defined in Wikipedia, an application server is a software engine that delivers applications to client computers or devices. The application server runs your server code. Some well known application servers are IIS (Microsoft), WebLogic Server (BEA), JBoss (Red Hat), WebSphere (IBM).
Compare C# and VB.NET
A detailed comparison can be found over here.
What is a base class and derived class?
A class is a template for creating an object. The class from which other classes derive fundamental functionality is called a base class. For e.g. If Class Y derives from Class X, then Class X is a base class.
 
The class which derives functionality from a base class is called a derived class. If Class Y derives from Class X, then Class Y is a derived class.
What is an extender class?
An extender class allows you to extend the functionality of an existing control. It is used in Windows forms applications to add properties to controls.
A demonstration of extender classes can be found over here.
What is inheritance?
Inheritance represents the relationship between two classes where one type derives functionality from a second type and then extends it by adding new methods, properties, events, fields and constants.
 
C# support two types of inheritance:
·         Implementation inheritance
·         Interface inheritance
What is implementation and interface inheritance?
When a class (type) is derived from another class(type) such that it inherits all the members of the base type it is Implementation Inheritance.
When a type (class or a struct) inherits only the signatures of the functions from another type it is Interface Inheritance.
In general Classes can be derived from another class, hence support Implementation inheritance. At the same time Classes can also be derived from one or more interfaces. Hence they support Interface inheritance.
Source: Exforsys.
What is inheritance hierarchy?
The class which derives functionality from a base class is called a derived class. A derived class can also act as a base class for another class. Thus it is possible to create a tree-like structure that illustrates the relationship between all related classes. This structure is known as the inheritance hierarchy.
How do you prevent a class from being inherited?
In VB.NET you use the NotInheritable modifier to prevent programmers from using the class as a base class. In C#, use the sealed keyword.
When should you use inheritance?
Read this.
Define Overriding?
Overriding is a concept where a method in a derived class uses the same name, return type, and arguments as a method in its base class. In other words, if the derived class contains its own implementation of the method rather than using the method in the base class, the process is called overriding.
Can you use multiple inheritance in .NET?
.NET supports only single inheritance. However the purpose is accomplished using multiple interfaces.
Why don’t we have multiple inheritance in .NET?
There are several reasons for this. In simple words, the efforts are more, benefits are less. Different languages have different implementation requirements of multiple inheritance. So in order to implement multiple inheritance, we need to study the implementation aspects of all the languages that are CLR compliant and then implement a common methodology of implementing it. This is too much of efforts. Moreover multiple interface inheritance very much covers the benefits that multiple inheritance has.
What is an Interface?
An interface is a standard or contract that contains only the signatures of methods or events. The implementation is done in the class that inherits from this interface. Interfaces are primarily used to set a common standard or contract.
When should you use abstract class vs interface or What is the difference between an abstract class and interface?
I would suggest you to read this. There is a good comparison given over here.
What are events and delegates?
An event is a message sent by a control to notify the occurrence of an action. However it is not known which object receives the event. For this reason, .NET provides a special type called Delegate which acts as an intermediary between the sender object and receiver object.
What is business logic?
It is the functionality which handles the exchange of information between database and a user interface.
What is a component?
Component is a group of logically related classes and methods. A component is a class that implements the IComponent interface or uses a class that implements IComponent interface.
What is a control?
A control is a component that provides user-interface (UI) capabilities.
What are the differences between a control and a component?
The differences can be studied over here.
What are design patterns?
Design patterns are common solutions to common design problems.
What is a connection pool?
A connection pool is a ‘collection of connections’ which are shared between the clients requesting one. Once the connection is closed, it returns back to the pool. This allows the connections to be reused.
What is a flat file?
A flat file is the name given to text, which can be read or written only sequentially.
What are functional and non-functional requirements?
Functional requirements defines the behavior of a system whereas non-functional requirements specify how the system should behave; in other words they specify the quality requirements and judge the behavior of a system.
E.g.
Functional - Display a chart which shows the maximum number of products sold in a region.
Non-functional – The data presented in the chart must be updated every 5 minutes.
What is the global assembly cache (GAC)?
GAC is a machine-wide cache of assemblies that allows .NET applications to share libraries. GAC solves some of the problems associated with dll’s (DLL Hell).
What is a stack? What is a heap? Give the differences between the two?
Stack is a place in the memory where value types are stored. Heap is a place in the memory where the reference types are stored.
 
Check this link for the differences.
What is instrumentation?
It is the ability to monitor an application so that information about the application’s progress, performance and status can be captured and reported.
What is code review?
The process of  examining the source code generally through a peer, to verify it against best practices.
What is logging?
Logging is the process of persisting information about the status of an application.
What are mock-ups?
Mock-ups are a set of designs in the form of screens, diagrams, snapshots etc., that helps verify the design and acquire feedback about the application’s requirements and use cases, at an early stage of the design process.
What is a Form?
A form is a representation of any window displayed in your application. Form can be used to create standard, borderless, floating, modal windows.
What is a multiple-document interface(MDI)?
A user interface container that enables a user to work with more than one document at a time. E.g. Microsoft Excel.
What is a single-document interface (SDI) ?
A user interface that is created to manage graphical user interfaces and controls into single windows. E.g. Microsoft Word
What is BLOB ?
A BLOB (binary large object) is a large item such as an image or an exe  represented in binary form.
What is ClickOnce?
ClickOnce is a new deployment technology that allows you to create and publish self-updating applications that can be installed and run with minimal user interaction.
What is object role modeling (ORM) ?
It is a logical model for designing and querying database models. There are various ORM tools in the market like CaseTalk, Microsoft Visio for Enterprise Architects, Infagon etc.
What is a private assembly?
A private assembly is local to the installation directory of an application and is used only by that application.
What is a shared assembly?
A shared assembly is kept in the global assembly cache (GAC) and can be used by one or more applications on a machine.
What is the difference between user and custom controls?
User controls are easier to create whereas custom controls require extra effort.
User controls are used when the layout is static whereas custom controls are used in dynamic layouts.
A user control cannot be added to the toolbox whereas a custom control can be.
A separate copy of a user control is required in every application that uses it whereas since custom controls are stored in the GAC, only a single copy can be used by all applications.
Where do custom controls reside?
In the global assembly cache (GAC).
What is a third-party control ?
A third-party control is one that is not created by the owners of a project. They are usually used to save time and resources and reuse the functionality developed by others (third-party).
What is a binary formatter?
Binary formatter is used to serialize and deserialize an object in binary format.
What is Boxing/Unboxing?
Boxing is used to convert value types to object.
E.g. int x = 1;
object obj = x ;
Unboxing is used to convert the object back to the value type.
E.g. int y = (int)obj;
Boxing/unboxing is quiet an expensive operation.
What is a COM Callable Wrapper (CCW)?
CCW is a wrapper created by the common language runtime(CLR) that enables COM components to access .NET objects.
What is a Runtime Callable Wrapper (RCW)?
RCW is a wrapper created by the common language runtime(CLR) to enable .NET components to call COM components.
What is a digital signature?
A digital signature is an electronic signature used to verify/gurantee the identity of the individual who is sending the message.
What is garbage collection?
Garbage collection is the process of managing the allocation and release of memory in your applications. Read this article for more information.
What is globalization?
Globalization is the process of customizing applications that support multiple cultures and regions.
What is localization?
Localization is the process of customizing applications that support a given culture and regions.
What is MIME?
The definition of MIME or Multipurpose Internet Mail Extensions as stated in MSDN is “MIME is a standard that can be used to include content of various types in a single message. MIME extends the Simple Mail Transfer Protocol (SMTP) format of mail messages to include multiple content, both textual and non-textual. Parts of the message may be images, audio, or text in different character sets. The MIME standard derives from RFCs such as 2821 and 2822”. Quoted from here.
Check out the other interview questions over here:
Give a +1 to this article if you think it was well written. Thanks!
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Suprotim Agarwal, ASP.NET Architecture MVP, MCSD, MCAD, MCDBA, MCSE, is the CEO of A2Z Knowledge Visuals Pvt. He primarily works as an Architect Consultant and provides consultancy on how to design and develop .NET centric database solutions.

Suprotim is the founder and primary contributor to DotNetCurry, DNC .NET Magazine, SQLServerCurry and DevCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls. and is authoring another one at The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal


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User Feedback
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<a href="http://www.dotnetinterviewfaqs.com/microsoft-dot-net-framework-faqs-job-interview-questions-answers.aspx">Microsoft.Net Framework Faqs</a>

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Comment posted by Sushma on Thursday, March 10, 2011 4:29 PM
Define Overriding?
Overriding is a concept where a method in a derived class uses the same name, return type, and arguments as a method in its base class. In other words, if the derived class contains its own implementation of the method rather than using the method in the base class, the process is called overriding.

This is not overriding this is overloading please change this
Comment posted by Mrinalini on Monday, April 11, 2011 2:36 AM
Hi sushma,
That isnt overloading it is overriding.
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Comment posted by jitendra garg on Monday, February 6, 2012 4:54 AM
What is business logic?
It is the functionality which handles the exchange of information between database and a user interface.

Really? Isn't this definition like saying "Sun is something that rises from east"? This is just a possible usage/property of business logic, not the definition. Being a consulting architect, I would have expected much more insightful article from you.  Add to that, this is the type of definition, interviewers rely on, to select next generation of leaders in IT. Future of IT looks scary.
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Comment posted by Ajay on Thursday, April 19, 2012 9:13 AM
There is one wrong example for the question "What is a single-document interface (SDI)?". Microsoft word is not a SDI application but it is MDI just like Microsoft Excel. Right(good) example for SDI application is Notepad (notepad.exe)
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Comment posted by Guy on Thursday, October 25, 2012 4:36 AM
Lots of errors mate... ORM - object relationship mapping and its not what you described.. (people usually mean in the context of ORM tools like Entity Framework). Delegates are variables that are 'pointers' to other functions and while they play a role in events can also have nothing to do with them.
Design Pattern = Common solutions for common design problems? stating the obvious doesn't explain what it is.
It goes on and on...
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Comment posted by skoop on Wednesday, January 16, 2013 2:19 PM
I didn't look at all the questions, but that is not really a good answer for why multiple inheritance doesn't exist for .NET languages.  The fact that .NET has multiple languages and the effort to implement would be too complicated is not really the issue, as MI isn't in Java either.  The main reason is probably more so that multiple inheritance is very error prone and can create hard to detect problems (i.e. the Diamond Problem)
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Comment posted by sohaib on Saturday, October 12, 2013 4:37 PM
Visit the following link to learn some commonly asked Interview Questions for the job or vacancy of Software Engineer or Software/Web/Desktop Application Developer. It also includes OOP, C#, ASP.NET, ADO.NET and SQL Interview Questions. http://sohaiby.blogspot.com/2013/09/software-engineerdeveloper-interview.html
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Comment posted by (Will not be displaye on Saturday, November 9, 2013 1:25 AM
Will not be displayed)
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Comment posted by sashi on Friday, January 3, 2014 4:54 AM
thank u sir
.net for beg..
is good & i like to now more interview qus on .net sir
Comment posted by Roberto on Wednesday, March 12, 2014 1:19 AM
"Can you use multiple inheritance in .NET?

.NET supports only single inheritance. However the purpose is accomplished using multiple interfaces."

I don't agree with this, an interface is a contract for a class and does not inherit anything other than the contract it must comply with. You can't do multiple inheritance in .NET. The closest to doing so would be having deeper level inheritance (A>B>C..)
Comment posted by chitra on Tuesday, July 8, 2014 2:48 AM
Thanks to Sharing the Dot
Net Material for Freshers and Experiences,
Link as, <a http://pankajtiwarii.blogspot.in/2013/11/aspnet-interview-question-and-answer.html
Comment posted by somesh on Friday, July 11, 2014 1:17 AM
Thanks for sharing
Some good questions are can also be found at http://jobs.bhoomijunction.com/blogs/frequently-asked-interview-questions-net--25
Comment posted by ' on Thursday, July 31, 2014 3:45 AM
    '
Comment posted by MUTHU JUNA on Thursday, August 14, 2014 12:58 AM
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Comment posted by MUTHU JUNA on Thursday, August 14, 2014 1:00 AM
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Comment posted by MUTHU JUNA on Thursday, August 14, 2014 3:52 AM
tnk u sir


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