Keep only first 20 entries in string
<p>I have a string that contains calculations.  Each entry has a space in between the next.  How do I keep only the most recent 20 entries?  </p>

<pre><code>Label2.text += TextBox1.Text + "+" + TextBox2.Text + "=" + Label1.Text + " ";
</code></pre>

<p>Output is:</p>

<p>20+20=40 40+20=60 60+20=80 </p>
