public void addLinkedlist1(int data1)
        {
            if (current_address1 == null)
            {
                current_address1 = new data1();
                first_address1   = current_address1;
                current_address1.set_data2(data1);
            }

            else
            {
                current_address1.set_nextaddress1();
                moveData1        = current_address1;
                current_address1 = current_address1.get_nextaddress1();
                current_address1.set_prevaddress1(moveData1);
                current_address1.set_data2(data1);
            }

            datasize1++;
        }
        public void replaceLinkedlist1(int index1, int data1)
        {
            data1 list1 = findLink1(index1);

            list1.set_data2(data1);
        }