Serial port reading data

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C#

.NET

Visual-Studio

serial-port

Hi, I designed an application in order to make data exchange , I developed an application in C # , I can sent and receive data as well, but the problem is that I get the data as character ASCII . I would like to receive the data in HEX byte by byte , I searched the in the net but I have not found a solution , so I would like if some one help and how to receive the data IN hexa byte .

Here is my piece of code to receive the data

String data;
    private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        data += serialPort1.ReadExisting();
        this.Invoke(new EventHandler(display_data_event));
    }
 
    private void display_data_event(object sender, EventArgs e)
    {
        textBox2.Text = data;
    }