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LINQ Interview Questions and Answers

1
What is Language Integrated Query (LINQ)?

LINQ is a set of extensions to .NET Framework that encapsulate language integrated query, set and other transformation operations. It extends VB, C# with their language syntax for queries. It also provides class libraries which allow a developer to take advantages of these features.

2
What are LINQ query expressions?

A LINQ query, also known as a query expression, consists of a combination of query clauses that identify the data sources for the query. It includes instructions for sorting, filtering, grouping, or joining to apply to the source data. The LINQ query expressions syntax is similar to the SQL syntax. It specifies what information should be retrieved from the data source.

3
What is Language Integrated Query (LINQ)?

LINQ is a set of extensions to .NET Framework that encapsulate language integrated query, set and other transformation operations. It extends VB, C# with their language syntax for queries. It also provides class libraries which allow a developer to take advantages of these features.

4
What are the types of LINQ?
  • LINQ to Objects
  • LINQ to XML
  • LINQ to Dataset
  • LINQ to SQL
  • LINQ to Entities
5
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 should be provided but with LINQ everything gets compiled into single DLL hence deployment becomes easy
  • Type Safety: LINQ is type safe, so queries errors are type checked at compile time
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