public void ComDataReceived(Object sender, SerialDataReceivedEventArgs e)
{
int len = COMPort.BytesToRead;
Byte[] readbuffer = new byte[len];
COMPort.Read(readbuffer, 0, len);
Rec.AppendText(BytesToString(readbuffer));
//String Recei = COMPort.ReadExisting();
//Rec.Text = Recei;
}