Obtain the letters between f and j
using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
class Program
{
static void Main()
{
var letters = new SortedSet("the quick brown fox");
foreach (char c in letters.GetViewBetween('f', 'j'))
Console.Write(c);
}
}
The output:
fhi