title: Difference between literal string and constants
body: <p>I am about to replace all the literal string in the message with the constants. But really wanted to know is there any performance optimization behind this or is just for following coding standards. In below sample I have class Constants.</p>
  
  <p>What are benefits of </p>
  
  <pre><code>var a=xmlNode.SelectNodes(Constants.DimLink);
  </code></pre>
  
  <p>Over</p>
  
  <pre><code>var a=xmlNode.SelectNodes("DimensionPointLink");
  </code></pre>