using System;
using System.Linq;

class Program
{
    static void Main()
    {
	// Array 1.
	var ints1 = new int[3];
	ints1[0] = 4;
	ints1[1] = 3;
	ints1[2] = 0;

	// Array 2.
	var ints2 = new int[3];
	ints2[0] = 5;
	ints2[1] = 4;
	ints2[2] = 2;

	{
	    // Join with method call.
	    var result = ints1.Join<int, int, int, int>(ints2,
		x => x + 1,
		y => y,
		(x, y) => x);

	    // Display results.
	    foreach (var r in result)
	    {
		Console.WriteLine(r);
	    }
	}

	{
	    // Join with query expression.
	    var result = from t in ints1
			 join x in ints2 on (t + 1) equals x
			 select t;

	    // Display results.
	    foreach (var r in result)
	    {
		Console.WriteLine(r);
	    }
	}
    }
}

Output

4  (First loop)
3
4  (Second loop)
3