private void button1_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog fileDialog = new OpenFileDialog())
            {
                if (fileDialog.ShowDialog() != DialogResult.Cancel)
                {
                    textBox1.Text = fileDialog.FileName;
                    using (BinaryReader fileBytes = new BinaryReader(new MemoryStream(File.ReadAllBytes(textBox1.Text))))
                    {
                        //Get the hex data in bytearray format
                        //This won't be displayed
                        int length = (int)fileBytes.BaseStream.Length;
                        byte[] hex = fileBytes.ReadBytes(length);
                        File.WriteAllBytes(@"c:\temp_file.txt", hex);

                        //This is what's displayed.
                        //Remember to make changes to the byte array
                        //and then update the view.
                        string tempStr = BitConverter.ToString(hex).Replace("-", " ");
                        richTextBox1.Text = tempStr;
                        bool isColour = true;




                        for (int i = 0; i < richTextBox1.TextLength; i++)
                            if (i % 4 == 1)
                            {
                                richTextBox1.SelectionStart = i;
                                richTextBox1.SelectionLength = 2;
                                richTextBox1.SelectionColor = Color.Red;
                            }
                    }
                }
            }

        }