using System;

using System.Text.RegularExpressions;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var em = new EmployeeMapping { CchUserType = UserTypeCode.Staff };

        var translatedEm = new TranslatedEmployee { CchUserType = UserTypeCode.User };

        var isNewUserTaxi = IsNewUserTaxi(em, translatedEm);

        var isNewUserTcp = IsNewUserTcp(em, translatedEm);

        Console.WriteLine("Is new user TCP: " + isNewUserTcp);  

        Console.WriteLine("Is new user taxi: " + isNewUserTaxi);    

    }

    private static bool IsNewUserTaxi(EmployeeMapping employeeMapping, TranslatedEmployee employeeToTranslate)

    {

        // from simplifier

        //return (employeeToTranslate.CchUserType == UserTypeCode.User && employeeMapping != null && employeeMapping.CchUserType == UserTypeCode.User) || (employeeToTranslate.CchUserType == UserTypeCode.User && employeeMapping == null);

        // Steve's change

        //return employeeMapping == null || (employeeMapping != null && employeeMapping.CchUserType != UserTypeCode.User);

        // original

        if (employeeToTranslate.CchUserType == UserTypeCode.User)

        {

            return employeeMapping == null || string.IsNullOrWhiteSpace(employeeMapping.CchUserType) || employeeMapping.CchUserType != UserTypeCode.User;

        }

        return false;

    }

    private static bool IsNewUserTcp(EmployeeMapping employeeMapping, TranslatedEmployee employeeToTranslate)

    {

        if ((employeeMapping == null && employeeToTranslate.CchUserType.Equals(UserTypeCode.User, StringComparison.OrdinalIgnoreCase))

            || (employeeMapping != null && employeeToTranslate.CchUserType.Equals(UserTypeCode.User, StringComparison.OrdinalIgnoreCase)

                && (string.IsNullOrEmpty(employeeMapping.CchUserType) || !employeeMapping.CchUserType.Equals(UserTypeCode.User, StringComparison.OrdinalIgnoreCase)))

            )

            {

                return true;

            }

            else

            {

                return false;

            }

    }

}

​

public static class UserTypeCode

{

    public static string Staff => "STF";

    public static string User => "USER";

}

​

public class EmployeeMapping

{

    public string CchUserType { get; set; }

}

​

public class TranslatedEmployee

{

    public string CchUserType { get; set; }

}