Is there a way in to append text in a textbox, but leave the original text?

In a program, I have a textbox for notes.  The note will be pulled from a text file.  I'd like it so the user can read the note, but not modify it.  If the user wants to add to the note, he can type below it.  Is there a way to have read only text in a textbox, but allow the user to add text below it, or do I need 2 textboxes to accomplish this?  I would like to keep it to one textbox if possible.

Once the user adds text below the current text, then I have an "Add Note" button that I would like to have add the users text at the bottom of previous read only text and now the additional text would also be read only.  Users could keep adding more and more notes to the textbox, which get saved to a text file.  Is this possible to do with one textbox, or do I need two?
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Panagiotis ToumpaniarisSystem EngineerCommented:
Are you looking for this perhaps :

Private Sub AppendTextBox1Text()
   ' Determine if text is selected in textBox1.
   If textBox1.SelectionLength = 0 Then
      ' No selection made, return.
   End If
   ' Determine if the text being appended to textBox2 exceeds the MaxLength property.
   If textBox1.SelectedText.Length + textBox2.TextLength > textBox2.MaxLength Then
      MessageBox.Show("The text to paste in is larger than the maximum number of characters allowed")
      ' Append the text from textBox1 into textBox2.
   End If
End Sub

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Éric MoreauSenior .Net ConsultantCommented:
You will need 2 controls. You cannot protect only part of a textbox content. It is all or nothing!

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BrianAuthor Commented:
Thanks for the help.  I didn't think it was possible, but wanted to check with the experts.  Thanks!
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