title: How to add newline character in app.config?
body: <p>I'm not getting as how to write a message in app.config which consists of two or more lines.
  My usual code in config file is :    </p>
  
  <pre><code>add key="msg_test" value="This is test message."       
  </code></pre>
  
  <p>And I read it in c sharp code like :    </p>
  
  <pre><code>ConfigurationSettings.AppSettings[msg_test];
  </code></pre>
  
  <p>And I want to write something like </p>
  
  <pre><code>add key="msg_test" 
      value="This is test message \n are you sure you want to continue?"
  </code></pre>