Server.Mobiles.PlayerMobile.CheckTrade C# (CSharp) Method

        public override bool CheckTrade(Mobile to, Item item, SecureTradeContainer cont, bool message, bool checkItems, int plusItems, int plusWeight)
        {
            int msgNum = 0;

            if (cont == null)
            {
                if (to.Holding != null)
                    msgNum = 1062727; // You cannot trade with someone who is dragging something.
                else if (this.HasTrade)
                    msgNum = 1062781; // You are already trading with someone else!
                else if (to.HasTrade)
                    msgNum = 1062779; // That person is already involved in a trade
            }

            if (msgNum == 0)
            {
                if (cont != null)
                {
                    plusItems += cont.TotalItems;
                    plusWeight += cont.TotalWeight;
                }

                if (this.Backpack == null || !this.Backpack.CheckHold(this, item, false, checkItems, plusItems, plusWeight))
                    msgNum = 1004040; // You would not be able to hold this if the trade failed.
                else if (to.Backpack == null || !to.Backpack.CheckHold(to, item, false, checkItems, plusItems, plusWeight))
                    msgNum = 1004039; // The recipient of this trade would not be able to carry this.
                else
                    msgNum = CheckContentForTrade(item);
            }

            if (msgNum != 0)
            {
                if (message)
                {
                    if (msgNum == 1154111)
                        SendLocalizedMessage(msgNum, to.Name);
                    else
                        SendLocalizedMessage(msgNum);
                }

                return false;
            }

            return true;
        }