C#

class CustomString
{
    public static implicit operator CustomString(string s)
    {
        return new CustomString();
    }

    public static implicit operator string(CustomString s)
    {
        return "";
    }
}

class CustomString
{
    private string _value;

    private CustomString(string s)
    {
        _value = s;
    }
    
    public static implicit operator CustomString(string s)
    {
        return new CustomString(s);
    }

    public static implicit operator string(CustomString s)
    {
        return s._value;
    }
}

enum ItemType { Serial, Lot };
struct ObjectIdentifier {
 string Identity { get; set; }
 ItemType Type { get; set; }
}

List<ObjectIdentifier> mySLNList = ...;

foreach(ObjectIdentifier oi in mySLNList)
 switch(oi.Type)
  ...

<blockquote class="FQ"><div class="FQA">Quote:</div>protected static ISession getSession(string configFile, bool createNew) 
        {
		    if (createNew) 
            {
			    return getSessionFactory(configFile).OpenSession();
		    }
		    else 
            {
			    if (null == configFile) 
                {
				    if (null == sessions)
                    {
                        sessions = new ThreadLocal<ISession>();
                    }
				    ISession session = sessions.get();
				    if (null == session || !session.IsOpen) 
                    {
					    session = getSessionFactory(null).OpenSession();
					    session.set(session);
				    }
				    return session;
			    }
			    else 
                {
				    if (null == mappedSessions) 
                    {
                        mappedSessions = new ThreadLocal<IDictionary>();
                    }
                    Dictionary<string, ISession> map = mappedSessions.get();
				    if (null == map) 
                    {
                        map = new Dictionary<string, ISession>(1);
                        mappedSessions.set(map);
				    }
				    ISession session = map[configFile];
				    if (null == session || !session.IsOpen) 
                    {
					    session = getSessionFactory(configFile).OpenSession();
					    map.Add(configFile, session);
				    }
				    return session;
			    }
		    }
	    }</blockquote>