public void stopRead()
 {
     try
     {
         if (mReaderType == READER_TYPE.READER_IMP)
         {
             mReaderIMP.Stop();
         }
         if (mReaderType == READER_TYPE.READER_TM)
         {
             mReaderTM.StopReading();
         }
         if (mReaderType == READER_TYPE.READER_DLX_PM)
         {
             mReaderDLXPM.StopInventory(mComPort);
         }
         if (mReaderType == READER_TYPE.READER_XD_PM)
         {
             mReaderXDPM.StopInventory();
         }
     }
     catch (Exception)
     {
     }
 }