Look my solution

  Public Sub Read_label(ByVal text As String)
        If text = "Read" Then
            Try
                Dim op As TagAccess.Sequence.Operation = New TagAccess.Sequence.Operation()
                op.AccessOperationCode = ACCESS_OPERATION_CODE.ACCESS_OPERATION_READ
                op.ReadAccessParams.MemoryBank = MEMORY_BANK.MEMORY_BANK_USER 
                op.ReadAccessParams.ByteCount = 0
                op.ReadAccessParams.ByteOffset = 0
                op.ReadAccessParams.AccessPassword = 0
                'op.ReadAccessParams.AccessPassword = m_ReadForm.m_ReadParams.AccessPassword
                m_ReaderAPI.Actions.TagAccess.OperationSequence.Add(op)

                'm_TriggerInfo = New TriggerInfo
                'm_TriggerInfo.StartTrigger.Type = START_TRIGGER_TYPE.START_TRIGGER_TYPE_IMMEDIATE
                'm_TriggerInfo.StartTrigger.Handheld.HandheldEvent = HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_PRESSED
                'm_TriggerInfo.StopTrigger.Type = STOP_TRIGGER_TYPE.STOP_TRIGGER_TYPE_IMMEDIATE
                'm_TriggerInfo.StopTrigger.Handheld.HandheldEvent = HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_RELEASED
                'm_TriggerInfo.StopTrigger.Handheld.Timeout = 0

                ' VALORES ORIGINALES
                m_TriggerInfo = New TriggerInfo
                m_TriggerInfo.StartTrigger.Type = START_TRIGGER_TYPE.START_TRIGGER_TYPE_HANDHELD
                m_TriggerInfo.StartTrigger.Handheld.HandheldEvent = HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_PRESSED
                m_TriggerInfo.StopTrigger.Type = STOP_TRIGGER_TYPE.STOP_TRIGGER_TYPE_HANDHELD_WITH_TIMEOUT
                m_TriggerInfo.StopTrigger.Handheld.HandheldEvent = HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_RELEASED
                m_TriggerInfo.StopTrigger.Handheld.Timeout = 0

                'UNCOMMENT IF WE NEED TO READ THE TAG JUST ONCE
                'myTriggerInfo.TagEventReportInfo.ReportNewTagEvent = TAG_EVENT_REPORT_TRIGGER.IMMEDIATE;
                'myTriggerInfo.TagEventReportInfo.ReportTagInvisibleEvent = TAG_EVENT_REPORT_TRIGGER.NEVER;
                'myTriggerInfo.TagEventReportInfo.ReportTagBackToVisibilityEvent = TAG_EVENT_REPORT_TRIGGER.NEVER;
                m_AntennaInfo = New AntennaInfo
                Dim antennaId() As System.UInt16 = New System.UInt16((1) - 1) {}
                antennaId(0) = 1
                'antennaId[1] = 2;
                m_AntennaInfo.AntennaID = antennaId
                Dim powerLevels() As Integer = m_ReaderAPI.ReaderCapabilities.TransmitPowerLevelValues
                m_AntennaConfig = New Antennas.Config
                m_AntennaConfig.TransmitPowerIndex = 250
                m_AntennaConfig.ReceiveSensitivityIndex = 0
                m_AntennaConfig.TransmitFrequencyIndex = 1
                m_ReaderAPI.Config.Antennas(1).SetConfig(m_AntennaConfig)

                If m_ReaderAPI.Actions.TagAccess.OperationSequence.Length > 0 Then
                    m_ReaderAPI.Actions.TagAccess.OperationSequence.PerformSequence(Nothing, m_TriggerInfo, m_AntennaInfo)
                Else
                    m_ReaderAPI.Actions.Inventory.Perform(Nothing, m_TriggerInfo, m_AntennaInfo)
                End If

                mconnect.Enabled = False
                mRead.Text = "Stop"
            Catch ofe As OperationFailureException
                MessageBox.Show(ofe.Message)
            Catch iue As InvalidUsageException
                MessageBox.Show((iue.Info + (";" + iue.Message)))
            Catch ex As Exception
                MessageBox.Show(ex.Message)
            End Try

        ElseIf (text = "Stop") Then
            Try

                If m_ReaderAPI.Actions.TagAccess.OperationSequence.Length > 0 Then
                    m_ReaderAPI.Actions.TagAccess.OperationSequence.StopSequence()
                Else
                    m_ReaderAPI.Actions.Inventory.Stop()
                End If
                mconnect.Enabled = True
                mRead.Text = "Read"

            Catch ofe As OperationFailureException
                MessageBox.Show(ofe.Message)
            Catch ex As Exception
                MessageBox.Show(ex.Message)
            End Try
        End If
    End Sub