public virtual void add(Task task)
{
if (task == null)
{
string str = "Null 'task' argument.";
Throwable.__\u003CsuppressFillInStackTrace\u003E();
throw new IllegalArgumentException(str);
}
else
{
this.tasks.add((object) task);
this.fireSeriesChanged();
}
}
public virtual void remove(Task task)
{
this.tasks.remove((object) task);
this.fireSeriesChanged();
}