using System;

public class Program

{

    public static void Main()

    {

​

        Console.WriteLine(isItInSNRange("1A1","1C1","1B1"));

        Console.WriteLine(isItInSNRange("ZQZ654101","ZQZ666000","ZQZ655A01"));

        Console.WriteLine(isItInSNRange("394654101x","394666000x","394667000x"));

​

        // Wrong Order

        Console.WriteLine(isItInSNRange("1C1","1A1","1B1"));

    }

​

    public static bool isItInSNRange(string start, string end, string deviceSn){

        // Force start being smallest, end being biggest

        if(start.CompareTo(end) >0){

            var temp = end;

            end = start;

            start = temp;

        }

​

        bool result = false;

        result = (start.CompareTo(deviceSn) <= 0 && end.CompareTo(deviceSn) >=0);

        return result;

    }

}