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private void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
int num = serialPort.BytesToRead;
byte[] dataBuffer = new byte[num];
serialPort.Read(dataBuffer, 0, num);
string strreceived = System.Text.Encoding.Default.GetString(dataBuffer);
textBoxData.AppendText(strreceived);
}