/// <summary>
 ///     Removes the scheduler entry.
 /// </summary>
 /// <param name="entry">The entry.</param>
 public virtual void RemoveEntry(SchedulerEntry entry)
 {
     if (_entries.Contains(entry))
     {
         _entries.Remove(entry);
         entry.Rule = null;
     }
 }
 /// <summary>
 ///     Adds the scheduler entry.
 /// </summary>
 /// <param name="entry">The entry.</param>
 public virtual void AddEntry(SchedulerEntry entry)
 {
     if (!_entries.Contains(entry))
     {
         _entries.Add(entry);
         entry.Rule = this;
     }
 }