/// <summary>
/// Closes serial connection.
/// </summary>
/// <param name="eventSender"></param>
/// <param name="eventArgs"></param>
private void CloseBtn_Click(System.Object eventSender, System.EventArgs eventArgs)
{
    try
    {
        gxSerial1.Close();
    }
    catch (Exception Ex)
    {
        MessageBox.Show(Ex.Message);
    }
}

                ''' <summary>
''' Closes serial port connection.
''' </summary>
Private Sub CloseBtn_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles CloseBtn.Click
    Try
        GxSerial1.Close()
    Catch Ex As Exception
        MessageBox.Show(Ex.Message)
    End Try
End Sub

                'Close serial connection
Private Sub CloseBtn_Click()
On Error GoTo GXErr
    GXSerial1.Close
    Exit Sub
GXErr:
    MsgBox Err.Description
End Sub