adding text in the backend destroying markup in richTextbox
<p>I'm making a small text editor in an greater application, so I've taken an richtextbox and added an tool strip whit somme buttons.</p>

<p>Actualy everything works of the edditing part.
My app requires to add a date time in the textbox everytime a button is clicked
and when I do so, the whole markup is gone.</p>

<p>So what I do is:</p>

<pre><code> private void button_click(object sender, EventArgs e)
 {
    richtextbox1.text += DateTime.Now.toString();
 }
</code></pre>
