Language-Integrated Query (LINQ) - .NET Interview Questions and Answers

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  1. What is Language Integrated Query (LINQ)?
    LINQ is a programming model that is the composition of general-purpose standard query operators that allow you to work with data, regardless of the data source in any .NET based programming language. It is the name given to a set of technologies based on the integration of query capabilities into any .NET language.
  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. Write the basic steps to execute a LINQ query.
    The following are the three basic steps to execute a LINQ query:
    • Obtain the data source (The data source can be either an SQL database or an XML file)
    • Create a query
    • Execute the query
  4. Write the basic syntax of a LINQ query in Visual Basic as well as in C#.
    In Visual Basic, the basic syntax of a LINQ query starts with the From clause and ends with the Select or Group By clause. In addition, you can use the Where, Order By, and Order By Descending clauses to perform additional functions, such as filtering data and generating the data in a specific order.

    In C#, the basic syntax of a LINQ query starts with the From clause and ends with the Select or group by clause. In addition, you can use the where, orderby, and Orderby descending clauses to perform additional functions, such as filtering data and generating the data in a specific order.
  5. In which statement the LINQ query is executed?
    A LINQ query is executed in the For Each statement in Visual Basic and in the foreach statement in C#.
  6. In LINQ, lambda expressions underlie many of the standard query operators. Is it True or False?
    It is true.


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