String formatting
<p>I made timer, which outputs time like this:</p>

<pre><code>0:1, 0:2, 0:3 ... 0:10 ...
string.Format("{0}:{1}", hours, minutes);
</code></pre>

<p>But I want to output as follows:</p>

<pre><code>00:01, 00:02, 00:03
</code></pre>
