How to read Binary Data from Serial Port without any Encoding?

This part of VR Karthikeyan's code:

//printing the read data
string str = BitConverter.ToString(e.Data);
txtData.AppendText(str);//txtData is a TextBox

To get the desirable output 00 00 e2 00 ......, change the above block to use string formatter "X" like this:

foreach (byte i in e.Data)
{
    // i is byte value, two hexadecimal digit is enough
    // to hold its value (max 255, hex FF). For illustration
    // space is appended after each byte printout. 
    string str2 = i.ToString("X2").Append(" ");
    txtData.AppendText(str2);
}

Yet this executes slowly due to appending text to txtData which is a textBox. When byte[] is large the speed difference shows. In that case use this technique to improve perceived performance, mainly by moving the .AppendText() operation outside of the loop:

using System.Text;

StringBuilder s = new StringBuilder();
foreach (byte i in e.Data)
{
    s.Append(i.ToString("X2")).Append(" ");
}
txtData.AppendText(s.ToString());

The technique employed StringBuilder to collect conversion results of all the bytes in the array e.Data. When the foreach loop finishes, txtData is appended in one go. To wrap this up, VR Karthikeyan's code can be written like this:

//-----------------------------------------------------------------
// StringBuilder class use this name space to import
//-----------------------------------------------------------------
using System.Text;

//-----------------------------------------------------------------
// The code snapshot, portion to print out the byte array fast
//-----------------------------------------------------------------
txtData.AppendText(OurOwnConverter(e.Data)); //txtData is a TextBox

//-----------------------------------------------------------------
// A formatter function is used to wrap up the converstion
//-----------------------------------------------------------------
string OurOwnConverter(byte[] byteArray)
{
    StringBuilder s = new StringBuilder();
    foreach (byte i in byteArray)
    {
        s.Append(i.ToString("X2")).Append(" ");
    }
    return s.ToString();
}