public void Write(string messageFormat, params object[] args)
{
string entry;
if (useRelativeTimestamps)
entry = string.Format("[{0}] ", (DateTime.Now - startTime)) + " " + string.Format(messageFormat, args);
else
entry = string.Format("[{0:h:mm:ss.fffffff}] ", DateTime.Now) + " " + string.Format(messageFormat, args);
lock(entries)
entries.Add(entry);
}