void Insert( int Data, unsigned int Position )
        {
            if ( Position > this -> Count )
            {
                return;
            }
            ITEM * Item = NULL;
            Item = new ITEM;
            if ( Item == NULL )
            {
                return;
            }
            Item -> Data = Data;
            if ( this -> Count == 0 )
            {
                Item -> Prev = NULL;
                Item -> Next = NULL;
                this -> First = Item;
                this -> Last = Item;
                this -> Active = Item;
                this -> Count ++;
                return;
            }
            if ( Position == 0 )
            {
                Item -> Prev = NULL;
                Item -> Next = this -> First;
                this -> First -> Prev = Item;
                this -> First = Item;
                this -> Count ++;
                return;
            }
            if ( Position == this -> Count )
            {
                Item -> Prev = this -> Last;
                Item -> Next = NULL;
                this -> Last -> Next = Item;
                this -> Last = Item;
                this -> Count ++;
                return;
            }
            if ( Position == this -> Position )
            {
                Item -> Prev = this -> Active -> Prev;
                Item -> Next = this -> Active;
                this -> Active -> Prev -> Next = Item;
                this -> Active -> Prev = Item;
                this -> Last = Item;
                this -> Count ++;
                return;
            }

        };