Using a string argument to represent an object
<p>If I have the following code:</p>

<pre><code>TextBox txtUsername = new TextBox();
void setEnabled(string str, bool enable)
{
    // use str to find the TextBox object
    // str.Enabled = enable;
}
</code></pre>

<p>Is this kinda thing even possible?</p>

<p>I want to be passing in 'Username' and then be prepending it with 'txt'.</p>
