Something

        public void AddItem(Item i)
        {
            if (i is Armor)
            {
                AddArmor((Armor)i);
                return;
            }
            if (i is Weapon)
            {
                AddWeapon((Weapon)i);
                return;
            }

            AddInt(i.CharacterID);
            AddInt(i.ModelID);
            AddUShort(i.Weight);
            AddUShort(i.GridPosX);
            AddUShort(i.GridPosY);
            AddUShort(i.GridSizeX);
            AddUShort(i.GridSizeY);
        }