how do I display a byte [] content in the following format

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WinForms

C#3.5

private void btnResize_Click(object sender, EventArgs e)
     {
         Width = 580;
         Height = 487;
       //  string []buffer =new byte[ richTextBox2.Text];

         byte[] buffer = Encoding.Default.GetBytes(richTextBox2.Text);

       //  byte[] buffer = BitConverter.GetBytes(Convert.ToDouble(richTextBox2.Text));

         // From byte array to string

         string bb = "";
         int i = 0;
         ////int numBytesToRead = buffer.Length;
         while (i < richTextBox2.TextLength)
         {
             if ((i % 8) == 0)
             {
                 bb = bb + "\n";
                 bb = bb + i.ToString("X8");
                 bb = bb + "\t";
             }
             else if ((i % 4) == 0)
             {
                 bb = bb + "\t";
             }
             bb = bb + buffer[i].ToString("X2"); // modified on 30june2014

             i = i + 1;
         }
         richTextBox2.Text = bb;

     }

Actually I did the display of hex data in richtexbox2 in following format
00000000 4D696372 6F736F66 74205351 4C205365
00000010 72766572 20416E61 6C797369 73205365

now when I click to the resize button which is on the form the above data should be like following format
00000000 4D696372 6F736F66
00000008 74205351 4C205365
00000010 72766572 20416E61
00000018 6C797369 73205365