Formatting or Padding Bytes

Hi, I'm using MS Visual Studio C# 2010. I am trying to read a file into a textbox as a Binary String. My code is at the end of this question.

My question is... when I get to bytes that are single digits like "0" or "A", I only get one digit printing out, rather than two. Such as below:

6C 79 2E D A 0 0 0 0 0 0 0 0 0

How should I format or pad my output, so it prints out as show below?

6C 79 2E 0D 0A 00 00 00 00 00 00 00 00 00


Code:

private void btnRead_Click(object sender, EventArgs e)
        {
            string path = @"F:\Mary had a little Lamb.txt";

            if (File.Exists(path))
            {
                Console.WriteLine("The file exists");
                StreamReader sr = new StreamReader(File.OpenRead (path));
                byte[] buffer = new byte[1000];
                sr.BaseStream.Read(buffer, 0, 1000);
                foreach ( byte myByte in buffer)
                {
                    tbxText.Text += myByte.ToString("X") + " ";
                }
             
                sr.Dispose();
            }
            else
            {
                Console.WriteLine("The file does NOT exists");
            }

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