How to use LINQ in C#?

Language Integrated Query (LINQ) is a Microsoft .NET Framework component and the uniform query syntax in C#. It has a set of method names and extends the language with query expressions.

For LINQ in C#, use −

using System.Linq;

Let us see an example. Here we have used the LINQ computational methods Count and Average to find the count of elements and average of those elements in C# −

Example

using System;
using System.Linq;

class Demo {
   static void Main() {
      int[] arr = { 87, 92, 45, 65, 34, 88 };

      Console.WriteLine(arr.Average());

      Console.WriteLine(arr.Count());
   }
}

output

68.5
6