/// <summary>
/// Update UI when media state changes.
/// </summary>
private void gxFile1_OnMediaStateChange(object sender, Gurux.Common.MediaState State)
{
    try
    {
        Boolean bOpen = (State == Gurux.Common.MediaState.Open);
        OpenBtn.Enabled = !bOpen;
        SendText.Enabled = SendBtn.Enabled = CloseBtn.Enabled = bOpen;
        ReceivedText.Enabled = PacketCounterTimer.Enabled = bOpen;
        //Close interval timer if media is closed.
        if (!bOpen)
        {
            IntervalTB.Enabled = IntervalTimer.Enabled = IntervalBtn.Enabled = false;
        }
        else
        {
            IntervalTB.Enabled = IntervalBtn.Enabled = true;
        }
    }
    catch (Exception Ex)
    {
        MessageBox.Show(this, Ex.Message);
    }
}

                ''' <summary>
''' Update UI when media state changes.
''' </summary>
Private Sub GxFile1_OnMediaStateChange(ByVal sender As System.Object, ByVal State As Gurux.Common.MediaState) Handles GxFile1.OnMediaStateChange
    Try
        Dim bOpen As Boolean
        bOpen = (State = Gurux.Common.MediaState.Open)
        OpenBtn.Enabled = Not bOpen
        SendText.Enabled = bOpen
        SendBtn.Enabled = bOpen
        CloseBtn.Enabled = bOpen
        ReceivedText.Enabled = bOpen
        PacketCounterTimer.Enabled = bOpen
        'Close interval timer if media is closed.
        If Not bOpen Then
            IntervalTB.Enabled = False
            IntervalTimer.Enabled = False
            IntervalBtn.Enabled = False
        Else
            IntervalTB.Enabled = True
            IntervalBtn.Enabled = True
        End If
    Catch Ex As Exception
        MessageBox.Show(Ex.Message)
    End Try
End Sub

                'media is opened or closed.
Private Sub GXFile1_OnMediaStateChange(ByVal sender As Object, ByVal State As GuruxFileCtl.GX_MEDIA_STATE_CHANGE)
On Error GoTo GXErr
    Dim bOpen As Boolean
    bOpen = (State = GX_MEDIA_STATE_CHANGE_OPEN)
    OpenBtn.Enabled = Not bOpen
    SendText.Enabled = bOpen
    SendBtn.Enabled = bOpen
    CloseBtn.Enabled = bOpen
    ReceivedText.Enabled = bOpen
    PacketCounterTimer.Enabled = bOpen
    'Close interval timer if media is closed.
    If Not bOpen Then
        IntervalTB.Enabled = False
        IntervalTimer.Enabled = False
        IntervalBtn.Enabled = False
    Else
        IntervalTB.Enabled = True
        IntervalBtn.Enabled = True
    End If
    'Enable echo if media is open and server.
    Exit Sub
GXErr:
    MsgBox Err.Description
End Sub