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void com_Received(object sender,SerialDataReceivedEventArgs e)
{
int n = sp.BytesToRead;
byte[] b = new byte[n];
sp.Read(b, 0, n);
builder.Clear();
string temp = Encoding.ASCII.GetString(b);
{
try
{
this.Invoke((EventHandler)(delegate
{
this.richTextBox1.AppendText(temp);
}));
}
catch (Exception)
{
MessageBox.Show("111111111");
}
}
}