LongCount with &&(and) operator : LongCount : LINQ C# Source Code

    
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        long count = Enumerable.Range(0, int.MaxValue).
        Concat(Enumerable.Range(0, int.MaxValue)).LongCount(n => n > 1 && n < 4);
        Console.WriteLine(count);
    }
}