title: How to get attribute xml without loop c#
body: <p>i have xml file like this</p>
  
  <pre><code>&gt; &lt;?xml version='1.0' ?&gt; 
     &lt;config&gt; 
       &lt;app&gt; 
         &lt;app version="1.1.0" /&gt;
  &gt;    &lt;/app&gt;
     &lt;/config&gt;
  </code></pre>
  
  <p>and i want to read attribute version from node app
  without any loop like this
  while(reader.read()) or foreach etc.</p>
  
  <p>Thanks</p>