public bool Equals(StockGroup other)
{
if (other == null)
{
return(false);
}
return(this.Id == other.Id);
}
public StockGroup CreateOrGet(StockGroup stockGroup)
{
if (stockGroup == null)
{
throw new ArgumentNullException();
}
if (!_stockGroups.Contains(stockGroup))
{
_stockGroups.Add(stockGroup);
}
return(stockGroup);
}