public bool SignIn(DrawerFlag _flag, int _id, int _managerid, int _employeeid)
{
lock (this.syncRoot)
{
CashDrawer _drawer = null;
if (TryGetDrawer(_flag, out _drawer, _id, _managerid))
{
return(_drawer.SignIn(_employeeid, time));
}
return(false);
}
}