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October 11 2013 6 11 /10 /October /2013 08:12

The most obvious answer everybody will come up with is,

  • When I want to get matching recordings between two tables I will use inner join.
  • When I want to get matching plus unmatchingrecords in the first/second/both tables I will use left/right/full outer join.

But does this answer satisfies everyone?. All through the answer is correct it doesn’t make your seat booked for the post you applied. During interview how you answer is more important than what’s your answer.

 

It should be like, when tables have “one to one”, “one to many”, “many to one” or “many to many” relationship use inner join. When table have “zero or one to one”,“zero or one to many”,“many to zero or one”,“zero or many to many” we will use outer join.

 

Both the answers are correct. But in “3 idiots” movie a very good dialogue was used “some don’t like simple answers” and it even applies during interviews.  

 

Hope this trick help you guys.
 

Happy Interview 

 

Below is a nice video SQL Server interview question video on inner joins , left joins and outer joins.


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October 2 2013 4 02 /10 /October /2013 15:48

This is one of the .NET interview questions asked in most of the interviews.

 

1) Factory Pattern: Used for de-coupling entities. For eg. decouple UI from middle tier or like decouple middle tier from data access.

 

2) Abstract factory pattern groups Factory Pattern logically.
 
3) Singleton: Used for caching and global sharing of data.
 
4) WCF: Used to communicate with non-microsoft like Java or CGI.


5) Restful service: When you want to communicate with cross platform clients and cross platform clients do not have ability to consume complicated SOAP messages.
 
Also view the following Design Pattern video on Lazy Loading

   

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September 28 2013 7 28 /09 /September /2013 08:03

Concurrency issues happen in multiuser environment when multiple people update the same data at the same time.

 

Below is the sequence of events how concurrency issues can happen:-

  • User A fetches data with value “X” and starts changing this value to “Y”.
  • User B also fetches the same “X” data and starts changing this value to “Z”.
  • Now User B first updates the data to database. In other words he changes the data to “Z”.
  • Now User A also sends the update to database. In other words he changes the data to “Y”.

Now User A thinks he has changed “X” to “Y” and User B thinks the current data is “Z”. Both of them are wrong and this leads to confusion termed as “Concurrency” problem.

 

Below is a nice video on c# indexer interview question with explanation.

 

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September 17 2013 3 17 /09 /September /2013 14:17

To detect if the call on the controller is “POST” action or a “GET” action we can use “Request.HttpMethod” property as shown in the below code snippet.

 

public ActionResult SomeAction()

{

            if (Request.HttpMethod == "POST")

            {

                return View("SomePage");

            }

            else

            {

                return View("SomeOtherPage");

            }

 

}

 

Read 50 MVC interview questions with answers from this code project article

 

http://www.codeproject.com/Articles/556995/Model-view-controller-MVC-Interview-questions-and

 

New to MVC start from the below video

 

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September 9 2013 2 09 /09 /September /2013 08:13

Code digger analyzes all the possible execution paths of your code and defines the behavior in terms of inputs and outputs. While the tool analyzes the code he also uncovers if there are any defects.

 

Read more about Visual studio code digger from here http://www.codeproject.com/Tips/650193/The-Code-Digger

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August 6 2013 3 06 /08 /August /2013 07:24

This is one of the confusing question asked during interviews. Many people believe that values in textbox get cleared after postback when EnableViewState property of page is set to false. There are some controls like Textbox (which inherit interface called IPostBackDataHandler) has the capability to restore their values from the posted back.

 

If we take a look at the sequence in which asp.net life cycle events executes we will find that, there is an event called LoadPostBackData which get raised between LoadViewState and Load event. This one is responsible for retaining values in the controls between postbacks.

PreInit - >Init ->LoadViewState ->LoadPostBackData -> Load ->ControlEvents ->PreRender ->SaveViewState - > Render -> Unload

So the conclusion is textbox values (in fact values of all control which inherit IPostBackDataHandler) are not dependent on page viewstate and thus values will be retained even after postback regardless of what value EnableViewState property contains.

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July 16 2013 3 16 /07 /July /2013 09:30

Thanks to questpond.com to provide these MVC interview questions and support this site.

 

As we know in MVC when we try to access any resource first request goes to action method in controller. After that action method will do some processing and return back the

 

Example:
 

publicclassHomeController : Controller
{
publicActionResult Index()
    {
return View();
    }
}

 

Action result will be one of the follows.

  • ContentResult – Represents a text result.
  • EmptyResult – Represents no result.
  • FileContentResult – Represents a downloadable file (with the binary content).
  • FilePathResult – Represents a downloadable file (with a path).
  • FileStreamResult – Represents a downloadable file (with a file stream).
  • JavaScriptResult – Represents a JavaScript script.
  • JsonResult – Represents a JavaScript Object Notation result that can be used in an AJAX application.
  • PartialViewResult – Represents HTML and markup rendered by a partial view.
  • RedirectResult – Represents a redirection to a new URL.
  • RedirectToRouteResult – Represents a result that performs a redirection by using the specified route values dictionary.
  • ViewResult – Represents HTML and markup rendered by a view

Now, in order to create the instance of one of the above classes it’s not required to explicitly create the object of ActionResult or any of the above classes. Your controller base class has some helper methods which you can call and simply return. Some of these methods are

Untitled

 

Do forget to read 50 MVC ( model view controller) interview questions with answers from codeproject.com

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June 24 2013 2 24 /06 /June /2013 11:23

Now a day’s lots of people ask interview questions around SQL Server data type and this is one is making lot of rounds during SQL Server interviews.

 

Money data type is the most suited data type for storing financial values as they are accurate ten-thousandth of the unit they represent. In financial figures accuracy matters. Small cents add up to millions later.

 

money-copy-1.png

 

 

Further money data type has two variations “money” and “smallmoney”. Money has 8 bytes of storage while small money has 4 bytes of storage.

 

This in awesome SQL Server interview question video: - Can SQL Server views be updated?

 

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June 10 2013 2 10 /06 /June /2013 08:07

What is JSON?

 

JSON stands for JavaScript Object Notation. JSON is a lightweight, language independent data interchange format.

How does JSON format looks like?

The format of JSON is as shown in the below code. It starts with a simple curly brackets, followed with comma separated value and pair and finally ending with a curly bracket.

 

The good part of JSON it just gets translated to javascript objects. For instance in the below figure you can see how the person variable has been transformed in to a person object with “FirstName” and “LastName” property.

 

 

Json.png


JSON interview questions :- How can you emit out JSON format using ASP.NET ?

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April 27 2013 7 27 /04 /April /2013 10:37

Introduction

 

When you are attending programming interviews you will always see a specific pattern in which the interviewer asks questions. It’s always good to know about this pattern so that you can perform well during interviews. I term this pattern as “What”, “Why “and “How” pattern .

 

“What” :- Do you really know the topic.
 

99% times a logical interviewer starts with “What” first. He tries to get a sense that do you at least have an idea of the topic. For instance let’s say the topic is “Delegate”. So the first question he would spin is “What is a delegate ?”.

 


In “What” kind of questions the interviewer is expecting sweet and to the point one liners which communicates that yes you know the topic. For example:-

 

Interviewer :- What is a delegate ?

Jobseeker :- Delegate is a pointer to a function.

 

“How”:- Are you hands on?

Once the interviewer is confident with the “What” part he can then ask questions of type “How” and “Why”. The “how” part tells the interviewer, Are your really hands-on the topic?.  Below is a simple example for the same:-

Interviewer: - How do you do forms authentication in ASP.NET?
JobSeeker :-  For forms authentication we need to do the following things :- 

Step 1:- Set the mode=”Forms” in web.config file.

Step 2:- In the code behind of the login page we need to call
“FormsAuthentication.RedirectFromLoginPage” function.

 
In the “How” part the interviewer is expecting you to provide overall important steps of you will execute that task.
 
“Why”:- Do you really know the depth of the topic?

The “Why” part of questions are tough ones. In this the interviewer tries to probe how much do you know the topic.  In this section he will probe in to real time scenarios and will try to probe do you know the topic in-depth.

For example:-

Interviewer: - Why is MVVM pattern for WPF and SL?
Candidate: - Because WPF and SL have rich bindings.

A simple example of questions around delegate

What is a delegate?
Delegate is a pointer to a function.

How do you code a delegate?
We first declare the delegate by using the “Delegate” keyword and point method to that delegate and then invoke the method by calling the “Invoke” method.

Why do you need a delegate?
Delegate is needed to provide callbacks. For instance you have a UI from which a long running routine is called. If your UI wants updates from that long running routine, then the UI can provide a delegate to the routine and the routine can send message via that delegate back to UI.

 
whw-copy-1.jpg


Some references for preparing .NET interviews:-

 

 

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Can you compare String.IsNullOrEmpty vs String.IsNullOrWhiteSpace ? ( .Net Interview questions with answers)

.NET interview questions: - Distinguish between Reflection and Dynamic?

.NET interview questions: - In which scenarios we can use serialization and when to use what binary serialization or XML serialization?

.NET interview questions: - Are there any readymade objects in .NET by which we can implement Lazy loading?

.NET interview questions: - What are different access modifiers?

ADO.NET interview questions: - Explain in detail the fundamental of connection pooling how to enable and disable connection pooling?

ADO.NET interview questions: - What is the namespace in which .NET has the data functionality class?

ADO.NET interview questions: - What are the different components in ADO.NET?

ADO.NET interview questions: - Show difference between “Optimistic” and “Pessimistic” locking and how many ways are there to implement optimistic locking in ADO.NET?

.NET interview questions: - Does code contract only do dynamic checks?

ADO.NET interview questions: - How can we fire a simple SQL Statement using ADO.NET?

.NET interview questions: - What basic steps are needed to display a simple report in crystal?

ADO.NET interview questions: - What are basic methods of Data adapter and mention the use of data adapter?

.NET interview questions: - What is UML? How many types of diagrams are there in UML?

.Net Interview Questions - What is MVC, MVP and MVVM pattern?

.NET interview questions: - How can you define a property read only for external world and writable in the same assembly?

Explain the implicit and explicit conversion of data types with examples?( .NET interview questions on data type)

.NET interview questions: - What is Reflection its implementation and practical uses?

What is downcasting and upcasting? (.NET interview questions with answers)

.NET interview questions: - How to decide on the design consideration to take a Data grid, data list or repeater?

.NET interview questions: - If we want to update interface with new methods, what is the best practice?

.NET interview questions: - How does selection sort algorithm works?

XML(.NET) interview questions: - What is XML?

.NET Interview questions: - If a validation is very complex what will you do?

.NET interview questions: - How can we stop the class from further inheriting?

XML (.NET) Interview questions :- Explain simple Walk through of XmlReader.

.NET interview questions : - How can we improve performance of .NET and show the difference between .NET 1.X, 2.0, 3.0, 3.5 and 4.0?

How to convert string to ENUM value ?( .NET interview questions with answers)

.NET architecture interview questions series: - What is mean by modeling language?

.NET architecture interview questions : - What are benefits and Limitation of using Viewstate, hidden frames and Cookies?

.NET interview questions: - What is GAC (Global Assembly Cache)?

.NET interview questions: - Explain Nuget?

.NET Testing interview questions: - What is the difference between Unit testing, Assembly testing and Regression testing?


.NET interview questions: - What is Code Access Security (CAS) and how does it work? Is CAS supported in .NET 4.0?


.NET interview questions: - What are the advantages /disadvantages of lazy loading?


.NET interview questions: - What is the use of DEBUG directive?


.NET testing interview questions: - What is Mock testing and how to implement it?


.NET interview questions: - What is the difference between DEBUG and Release?


.NET testing interview questions: - How can we UNIT test private methods using VSTS? Is it good to practice to UNIT test Private methods?


Explain 3 layer architecture ( .NET Interview questions)?


.NET interview questions : - What is a delegate and how can we create a delegate? What is a multicast delegate?


ADO.NET interview questions: - How to add/remove row is in “Data Table” object of “Dataset”? How to load multiple tables in a Dataset & adding relation between tables in a Dataset?


What is the difference between Array, ArrayList and List?( .Net Interview questions)

.NET interview questions: - How to implement DTC in .NET?
.NET interview questions: - What is an Interface and what are abstract classes

.NET interview questions: - Interface vs. abstract class

.NET interview questions: - How to implement practically Lazy loading in .NET?


.NET interview questions: - How can we handle exceptions in .NET? What if we do not catch the exception?

.NET interview questions based on Projects.


.NET interview questions: - What is shadowing? What is the difference between Shadowing and Overriding?

.NET interview questions: - All about Design Patterns in .NET


.NET interview questions: - How can we improve performance of .NET/ASP.NET/SQL Server?

.NET interview questions: - What benefits does sealed keyword provide?


.NET Architecture UML interview question


.NET interview questions: - How to maintain performance and can clean unmanaged objects?


.NET interview questions: - Explain ENUM and its benefits? What is the use of Flagsin ENUM?

.NET interview questions: - How to create a windows service using .NET?

.NET interview questions: - Explain in details about Indexer and can we have static indexer in C#?

.NET interview questions: - What is the difference between arraylist and list? Are Arraylist faster or Arrays?

.NET interview questions: - What is Native Image Generator (Ngen.exe)? Does NGEN.EXE always improve performance?

.NET OOPS interview questions: - What is OOP? What are different properties provided by Object-oriented systems?

.NET OOPS interview questions: - How abstract with only abstract method is it different from interfaces? Also mention best practice to update interface with new methods?

.NET interview questions: - What is the difference between delegate and events? Can we have return type, access modifiers and shared events?

.NET interview questions: - What is Manifest? Where is the version information stored of an assembly? Is versioning applicable to private assemblies?

.NET Generics interview questions: - Explain Generics and concept of Generic Collection in .NET?

How to learn .NET: - In parent-child relationship which constructor will fire first and in which instances you will declare a constructor private?

Basics of .NET and learning tutorials on CTS and CLS


Online resource to learn .NET on Reflection and Dynamic

Online guide to learn .NET for Object initializer in C#?

QuestPond for Freshers on IL code, JIT, CLR, CTS, CLS and CAS

QuestPond: Interview Questions and Answers on AJAX and how does it help?



ASP.NET Interview Questions & Answers Article










MVC Interview Questions And Answers Article

 

(MODEL VIEW CONTROLLER)MVC INTERVIEW QUESTIONS AND ANSWERS

 

MVC INTERVIEW QUESTIONS WITH ANSWERS VIDEO: – WHAT IS WEB API HOW TO IMPLEMENT THE SAME?

 

ASP.NET MVC  4 INTERVIEW QUESTIONS WITH ANSWERS: - WHAT IS BUNDLING AND MINIFICATION IN MODEL VIEW CONTROLLER ?

 

MVC INTERVIEW QUESTIONS WITH ANSWERS :- IS IT POSSIBLE TO RETURN VALUES INSTEAD OF ACTIONRESULTS?

 

MVC INTERVIEW QUESTIONS WITH ANSWERS :- WHAT ARE THE ACTIONRESULTS AVAILABLE IN MVC?

 

MVC INTERVIEW QUESTIONS WITH ANSWERS:-HTML.PARTIALVSHTML.RENDERPARTIALVSHTML.RENDERPAGE IN MVC

MVC VS ASP.NET ( MVC INTERVIEW QUESTION WITH ANSWERS )?

 

HOW CAN WE DETECT THAT A MVC CONTROLLER IS CALLED BY POST OR GET ? ( ASP.NET MVC INTERVIEW QUESTIONS WITH ANSWERS)

 

WHAT ARE THE DIFFERENT WAYS BY WHICH YOU WILL GET FORM DATA IN CONTROLLER? ( MVC INTERVIEW QUESTIONS WITH ANSWERS)

 

WHAT IS THE DIFFERENCE BETWEEN PRESENTER AND CONTROLLER IN MVC?(MVC INTERVIEW QUESTIONS WITH ANSWERS)

 

LEARN MVC (MODEL VIEW CONTROLLER) STEP BY STEP IN 7 DAYS – DAY 4

 

MVC Interview questions and answers PDF

 

MVC interview questions with answers

 

ActionResult vs. View() vs. ViewResult :- MVC interview questions with answers

Explain Areas in MVC?( MVC interview questions with answers)

 

Can you explain the purpose of ViewModel in MVC?( ASP.NET MVC Interview questions with answers)

ASP.NET MVC interview questions: - What are Filters in MVC?

What are areas in MVC?( MVC Interview questions with answers)

Explain the concept of View Model in MVC? 

Exception Handling in MVC

Explain MVC application life cycle?

100 MVC Interview question PDF download released , Enjoy

How can we use two (multiple) models with a single view?(MVC Interview questions)

MVC HTML.Form vs Ajax.Form – MVC interview questions with answers

Learn Microsoft Business intelligence step by step – Day 1

Can you create TempBag just like ViewBag?( MVC Interview questions)

MVC Unit Testing Unleashed

MVC and .NET learning tutorials for components of MVC and how do you perform unit testing in MVC?

Explain MVC model binders ? ( ASP.NET MVC interview questions)

Explain the difference between layout and master pages ? (MVC Razor interview questions) 


ENTITY FRAMEWORK INTERVIEW QUESTIONS ARTICLE


Windows Workflow Foundation(WWF) interview questions with answers Article

XML Interview Questions With Answers Article


Explain XML,DTD and XSL?(XML interview questions with answers)

HTML 5 Interview questions With Answers Article

HTML 5 interview questions with answers for LocalStorage and SessionStorage

 

How is the page structure of HTML 5 different from HTML 4?( HTML 5 Interview questions with answers)

 

What is datalist in HTML 5 ( ASP.NET HTML interview questions)?

 

What are the different new form element types in HTML 5?( ASP.NET HTML 5 interview questions with answers)

 

What is output element in HTML 5?( ASP.NET HTML 5 interview questions)

 

What is the difference between Canvas and SVG graphics?(ASP.NET HTML 5 interview questions with answers)

 

ASP.NET HTML 5 interview questions on SVG and Canvas

ASP.NET HTML5 interview questions with answers

What are web workers and why do we need them ?( ASP.NET HTML interview questions with answers)

 

Why do we need HTML 5 server-sent events? (ASP.NET HTML interview questions)

How can we add and remove data from local storage?(ASP.NET HTML 5 interview questions)

What is local storage concept in HTML 5? ( ASP.NET HTML 5 interview questions)

What is the difference between local storage and cookies? ( ASP.NET HTML 5 interview questions)

What is WebSQL?( ASP.Net HTML 5 interview questions)

 

What is session storage and how can you create one?( ASP.Net HTML 5 interview questions with answers)

 

What is application cache in HTML5?( ASP.NET HTML 5 interview questions with answers)

ASP.NET HTML 5 Application cache interview questions with answers

 

Explain the term cascading in style sheet ? ( CSS Interview questions)

What is difference between DIV vs SPAN in HTML ?( ASP.Net Interview questions)

HTML 5 Canvas Interview questions: - Canvas in HTML 5.

QuestPond’s interview questions and answers on HTML 5

 

Learn HTML 5 in 3 days – Day 1

 

 

 

Dotnetspider Questions And Answers Article

 

 

What is downcasting and upcasting ? ( .NET interview questions with videos)

 

What is the difference between String vs string? ( C# interview questions) ?

 

 

JAVASCRIPT INTERVIEW QUESTIONS WITH ANSWERS ARTICLE

 


3 IMPORTANT JAVASCRIPT IMPORTANT INTERVIEW QUESTION WITH ANSWERS