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Thread.Sleep(100);
StringBuilder builder = new StringBuilder();
int n = serialPort1.BytesToRead;
byte[] buf = new byte[n];
serialPort1.Read(buf, 0, n);
builder.Remove(0, builder.Length);
this.Invoke((EventHandler)(delegate
{
char[] cpara = Encoding.ASCII.GetChars(buf);
string str = new String(cpara);
this.textBox1.Text = str;
}));