Get chars between begin and end chars

GetCharsInBetween

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            foreach (var c in GetCharsInBetween('b', 'x'))
                Console.WriteLine(c);

            Console.Read();
        }

        private static IEnumerable<char> GetCharsInBetween(char begin, char end)
        {
            if (begin > end)
                throw new ArgumentException("invalid arguments.");

            begin = char.ToLower(begin);
            end = char.ToLower(end);

            while (begin < end - 1)
            {
                yield return NextChar(begin);
                begin++;
            }
        }

        private static char NextChar(char c)
        {
            return Convert.ToChar((int)c + 1);
        }
    }
}