Mask to format int 1, 10, 100, to string "001", "010", "100"
<p>How do I apply a mask to a string aiming to format the output text in the following fashion (at most 2 leading zeros):</p>

<pre><code>int a = 1, b = 10, c = 100;
string aF = LeadingZeroFormat(a), bF = LeadingZeroFormat(b), cF = LeadingZeroFormat(c);
Console.Writeline("{0}, {1}, {2}", aF, bF, cF); // "001, 010, 100" 
</code></pre>

<p>What is the most elegant solution?</p>

<p>Thanks in advance.</p>
