using System;

using System.Collections.Generic;

public class Program

{

    private static List<string> myList = new List<string> {"a","b","c","d","e","f","g","h"};

    public static void Main()

    {

        MyFunction("c","f");

        Console.WriteLine();

        MyFunction("g","b");

    }

    private static void MyFunction(string listItem, string anotherListItem)

{

    bool betweenTwoItems = false;

    foreach(var item in myList)

    {

        if(item == listItem || item == anotherListItem)

        {

            betweenTwoItems = !betweenTwoItems;

            if(!betweenTwoItems)

            {

               break;

            }

        }

​

        if(betweenTwoItems )

        {

            Console.WriteLine(item);

        }

    }

}

}