Collections C# Book

SymmetricExceptWith removes all but the elements that are unique to one set or the other.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
class Sample
{
public static void Main()
{
var letters = new HashSet("the quick brown fox");
letters.SymmetricExceptWith("the lazy brown fox");
foreach (char c in letters)
Console.Write(c);
}
}
The output:
quicklazy