public void CloseConnnection() { if (_utecConn != null) { _utecConn.DataReceived -= _utecConn_DataReceived; _utecConn.ErrorReceived -= SerialConnection_ErrorReceived; _utecConn.Stop(); _utecConn.Dispose(); _utecConn = null; } if (_externalWB != null) { _externalWB.ErrorReceived -= SerialConnection_ErrorReceived; _externalWB.Stop(); _externalWB.Dispose(); _externalWB = null; } }