private static void AddNetInfos(IStep step, IODBLayer parentLayer, String NetName, IODBObject netItem)
        {
            if (NetName.Length == 0) //the default net
            {
                NetName = "$NONE$";
            }

            int  lastNetNr = step.GetNets().Count;
            INet outNet    = step.GetNet(NetName);
            int  netNr     = -1;

            if (outNet == null)
            {
                netNr = step.AddNet(NetName, "", out outNet);
            }
            else
            {
                netNr = outNet.GetNetNumber();
            }

            netItem.PcbNetNumber = outNet.GetNetNumber();                          //set the netinformation to the object
            int newNr = outNet.AddLayerRef(parentLayer.GetLayerName(), lastNetNr); //each net saves a list of all layers are used.

            if (newNr == lastNetNr)
            {
                lastNetNr++;
            }
            parentLayer.SetNetNumber(NetName, netItem.PcbNetNumber);                                       //for each object the layer needs information that this net is used.
            outNet.AddFID(PCBI.FidType.Copper, parentLayer.GetLayerName(), netItem.GetIndexOnLayer(), ""); //this is specific to ODB++, if you don't use it and save the data as ODB++ some information get lost.
        }