public void DeleteStump(string stumpId)
{
_lock.EnterWriteLock();
var stump = _stumpReference[stumpId];
_stumpReference.Remove(stumpId);
_stumpList.Remove(stump);
_server.DeleteStump(stumpId);
_dataAccess.StumpDelete(this.ServerId, stumpId);
_lock.ExitWriteLock();
}