private void button_add_Click(object sender, EventArgs e)
        {
            ArrayList roomInfo = new ArrayList();

            roomInfo.Add(textBox_roomno.Text);
            roomInfo.Add(comboBox_roomtype.Text);
            roomInfo.Add(textBox_numbed.Text);
            roomInfo.Add(textBox_unitprice.Text);
            roomInfo.Add(comboBox_building.Text);
            roomInfo.Add(comboBox_floor.Text);

            DatabaseHelperClass ob = new DatabaseHelperClass(roomInfo);

            if (ob.insertRoomInfo())
            {
                MessageBox.Show("Room Added");
            }
            else
            {
                MessageBox.Show("Error Adding Room");
            }
        }