using timer with label text changed event

Hi all. I have a problem. In my project I used a timer and a label. Timer interval is 1000 and timer tick event controls a memory adress changed or not changed. I take this value to a label text property. I control in label text changed event that if value 256 or 0. while value is 256 I want only one entry in my database table but it entyr 1 record in my database table for each second. how can ı solve this? Please help me. Thanks for everything.

 private void SensorUpdateTimer_Tick(object sender, EventArgs e)
        {
            if (!m_client.Connected) return;
            string[] addresses = mqueryTB.Text.Split(new char[] { ',' });
            MemoryStream ms = new MemoryStream();
            string cmd = "readplcm " + (addresses.Length * 2).ToString() + " ";
            byte[] cmdBuf = Encoding.ASCII.GetBytes(cmd);
            ms.Write(cmdBuf, 0, cmdBuf.Length);
            foreach (string adr in addresses)
            {
                UInt16 offset = UInt16.Parse(adr.Trim());
                ms.Write(BitConverter.GetBytes(offset), 0, 2);
            }
            byte[] data = ms.ToArray();
            m_state = State.MQuery;
            m_client.GetStream().Write(data, 0, data.Length);
        }

//////////////////////////////////////

 private void resultL_TextChanged(object sender, EventArgs e)
        {
            DataAccessLayer dal = new DataAccessLayer("connectionString", true, false);
            int sonuc=0;
            string videoName=axWindowsMediaPlayer1.Ctlcontrols.currentItem.name;
            SqlParameter[] prms=new SqlParameter[1];
            prms[0] = new SqlParameter("@vnameStart", videoName);
            if (resultL.Text=="256")
            {
                sonuc = dal.Execute("Usp_InsertNewSensorRecord", prms, CommandType.StoredProcedure);
            }
            else
            {
                //
            }
        }