What is the best way to execute math expression?
<blockquote>
  <p><strong>Possible Duplicates:</strong><br>
  <a href="http://stackoverflow.com/questions/355062/is-there-a-string-math-evaluator-in-net">Is there a string math evaluator in .NET?</a><br>
  <a href="http://stackoverflow.com/questions/1437964/best-and-shortest-way-to-evaluate-mathematical-expressions">Best and shortest way to evaluate mathematical expressions</a>  </p>
</blockquote>



<p>I have a string variable</p>

<pre><code>string exp = "12+34+4*56+(23*45+12)2/30"
</code></pre>

<p>what is the best way of doing it ? without the using of third party dll ?</p>
