Limit min and max Length (character input ) in MaskedTextBox mask
<p>I need to configure the <code>Mask</code> property of a MaskedTextBox to take in a password that meets the following criteria:</p>

<ul>
<li>Minimum of 4 alphanumeric characters </li>
<li>Maximum of 15 alphanumeric    characters</li>
</ul>

<p>I have tried setting the mask to the string "aaaa" but that did not work</p>