Linq Interview Questions And Answers

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Top Linq interview questions and answers for freshers and experienced

What is Linq ?

Answer :

Questions : 1 :: Explain what is LINQ? Why is it required?

Language Integrated Query or LINQ is the collection of standard query operators which provides query facilities into.NET framework language like C#, VB.NET. LINQ is required as it bridges the gap...View answers

Questions : 2 :: What are the types of LINQ?

LINQ to Objects LINQ to XML LINQ to Dataset LINQ to SQL LINQ to Entities

Questions : 3 :: Explain how LINQ is useful than Stored Procedures?


Debugging: It is difficult to debug a stored procedure but as LINQ is part of.NET, visual studios debugger can be used to debug the queries Deployment: For stored procedure, additional script...View answers

Questions : 4 :: List out the three main components of LINQ? Explain what is the extension of the file, when LINQ to SQL is used?

Three main components of LINQ are Standard Query Operators Language Extensions LINQ Providers The extension of the file used is .dbml

Questions : 5 :: Define what is Where clause and Let clause?

Where clause: It allows adding some conditional filters to the query. Let clause: It allows defining a variable and assigning it a value calculated from the data...View answers

Questions : 6 :: Explain why SELECT clause comes after FROM clause in LINQ?


With other programming language and C#, LINQ is used, it requires all the variables to be declared first. “FROM” clause of LINQ query defines the range or conditions to select records....View answers

Questions : 7 :: Explain what is the use of System.XML.Xlinq.dll?

System.Data.Dlinq.dll provides the functionality to work with LINQ to SQL

Questions : 8 :: Explain what is lambda expressions in LINQ?

Lambda expression is referred as a unique function use to form delegates or expression tree types, where right side is the output and left side is the input to the method. For writing LINQ queries...View answers

Questions : 9 :: Explain how LINQ with databases can be used?


LINQ supports XML, SQL, Dataset and Objects. Through LINQ to objects or LINQ to Datasets one can use LINQ with other databases. The objects and datasets take care of database particular operations,...View answers

Questions : 10 :: Explain what is the difference between Skip() and SkipWhile() extension method?

Skip() : It will take an integer argument and from the given IEnumerable it skips the top n numbers SkipWhile (): It will continue to skip the elements as far as the input condition is true. It...View answers

Questions : 11 :: In LINQ how will you find the index of the element using where () with Lambda Expressions?

In order to find the index of the element using where () with the lambda expression Where ( ( i, ix ) => i == ix);

Questions : 12 :: Explain how you can assign a lambda expression to a delegate?

To assign a lambda expression to a delegate Delegate int del (int i); Del myDelegate=x=>x*x;     Intj = myDelegate (4);...View answers

Questions : 13 :: Explain what is the difference between Statement Lambda and Expression Lambda?

Expression Lambdas are extensively used in the construction of Expression Trees To create expression trees statement lambdas cannot be used

Questions : 14 :: Mention what is the role of DataContext classes in LINQ?

DataContext class acts as a bridge between SQL Server database and the LINQ to SQL. For accessing the database and also for changing the data in the database, it contains connections string and the...View answers

Questions : 15 :: Explain what are LINQ query expressions?

Query expression is nothing but an LINQ query. It is a combination of query clauses that identifies the data sources for a query. It contains information for sorting, filtering, grouping or joining...View answers

Questions : 16 :: Explain what are compiled queries?

In compiled LINQ queries, the plan is cached in a static class and static class is a global cache. Rather than preparing the query plan from scratch, LINQ prepares plan using stating class...View answers

Questions : 17 :: Explain how standard query operators useful in LINQ?

Standard Query Operators useful in LINQ are Get a total count of elements in the collection Order the results of a collection Grouping Computing average Joining two collections based on...View answers

Questions : 18 :: Explain what is the purpose of LINQ providers in LINQ?

LINQ providers are set of classes that take an LINQ query which generates method that executes an equivalent query against a particular data source.

Questions : 19 :: Explain how you can retrieve a single row with LINQ?

To retrieve a single row with LINQ we need Public User GetUser (string userName) { DBNameDataContext myDB = new DBNameDataContext ( ) ; User user = myDB. Users. Single ( u, u.UserName =>...View answers

Questions : 20 :: LINQ query is executed in which statement?

In VB, an LINQ query is executed in the For Each Statement, and in the foreach statement for C#.

Questions : 21 :: Explain what is "LINQ to Objects"?

When LINQ queries any IEnumerable(Of T) collection or IEnumerable directly without the use of an intermediate LINQ provider or API such as LINQ to SQL or LINQ to XML is referred as “LINQ to...View answers

Questions : 22 :: Explain how you can differentiate between Conversion Operator "ToDictionary" and "IEnumerable" of LINQ?

To solve the conversion type problems “IEnumerable” and “ToDictionary” conversion operator are used. “ToDictionary” conversion operator is the instance of...View answers

Questions : 23 :: How LINQ is beneficial than Stored Procedures?

There are couple of advantage of LINQ over stored procedures. 1. Debugging - It is really very hard to debug the Stored procedure but as LINQ is part of .NET, you can use visual studio's debugger...View answers

Questions : 24 :: Why Select clause comes after from clause in LINQ?

The reason is, LINQ is used with C# or other programming languages, which requires all the variables to be declared first. From clause of LINQ query just defines the range or conditions to select...View answers

Questions : 25 :: What is the use of System.XML.XLinq.dll?

System.XML.XLinq.dll contains classes to provide functionality to use LINQ with XML.

Questions : 26 :: What is the use of System.Data.DLinq.dll?

System.Data.DLinq.dll provides functionality to work with LINQ to SQL.

Questions : 27 :: Which assembly represents the core LINQ API?

System.Query.dll assembly represents the core LINQ API.

Questions : 28 :: What is the benefit of using LINQ on Dataset?

The main aim of using LINQ to Dataset is to run strongly typed queries on Dataset. Suppose we want to combine the results from two Datasets, or we want to take a distinct value from the Dataset,...View answers
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