C# read byte array from SerialPort -

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i ask why program returns first byte instead of byte. usb port sending byte value of 23, however, when c# program reads it, receives value of 2. why happening? c# code below 

    private void button1_click(object sender, eventargs e)     {                        serialport port = new serialport("com4", 9600);         port.open();          byte[] buffer = new byte[2];          port.read(buffer, 0, 2);         handleserialdata(buffer);          port.close();     }      private void handleserialdata(byte[] respbuffer)     {         string one, two;         char a, b;          = convert.tochar(respbuffer[0]);         b = convert.tochar(respbuffer[1]);          1 = convert.tostring(a);         2 = convert.tostring(b);          messagebox.show(one + two);                 }


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