LINQ is nothing but an acronym of Language Integrated Query that is part of programming language. LINQ provides an easy way to write or query data with a specified syntax like we would use the where clause when trying to query data for some specific criteria. So, we can say that LINQ is a syntax that is used to query data.

In this section, we will see a simple example to query data. We have Person list and the following code snippet provides us a various way to query data:

private static void TestLINQ() 
{ 
    var person = from p in Person.GetPersonList() 
        where p.Id == 1 
        select p; 
    foreach (var per in person) 
    { 
        WriteLine($"Person Id:{per.Id}"); 
        WriteLine($"Name:{per.FirstName} {per.LastName}"); 
        WriteLine($"Age:{per.Age}"); 
    } 
     
} 

In the preceding code snippet, we are querying List of persons for personId =1. The LINQ query returns a result of IEnumerable<Person> type which can be easily accessed...