How to send and receive 1024 Bits?

[marwanharb]

hello, I'm designing an interface using windows Forums and I want to send and receive 1024 bits using serial port, the number is in the hex-form, so what I did is the next:

  private void button2_Click(object sender, EventArgs e)
            {
                int i;
                int a=0;
                byte[] mychar;
                mychar = new byte[128];
                string M = textBox1.Text;

                for (i = 0; i < 127; i++ ) {
                mychar[i] = Convert.ToByte((M.Substring(a,2)),16);
                a += 2;
                }
                serialPort1.Write(mychar,0,127);
            }

and to check if the data is correct or not, I shorted out both the transmitter and receiver so I can see what I send from textbox1 to be shown in textbox5, the problem is the textbox is shown the output as ASCII, and I couldn't tell how to convert it to Hex again ,(see my attempt as commented bellow):

private void displaytext(object s, EventArgs e)
        {
            
            textBox5.Clear();
             textBox5.AppendText(RXstring);
//int value = Convert.ToInt32(RXstring, 16);
             //string stringValue = Char.ConvertFromUtf32(value);
             //textBox4.AppendText(stringValue);
        }

so to summarize my problems:
1- Is the code to send data is correct?
2- How can I force the textbox to show the output as Hex?

thank you very much.