title: Converting string expression to Integer Value using C#
body: <p>Sorry if this question is answered already, but I didn't find a suitable answer.
  I am having a string expression in C# which I need to convert to an int or decimal value. </p>
  
  <p>For example:</p>
  
  <pre><code>string strExp = "10+20+30";
  </code></pre>
  
  <p>the output should be 60.</p>
  
  <p>how shall I do that???</p>