title: MongoDB Update Query
body: <p>In MongoDB I want to update the new balance + old balance for <code>User1</code>.</p>
  
  <p><b>Example:</b></p>
  
  <p>Table Before Update:</p>
  
  <pre><code>Name    Balance
  User1   10
  </code></pre>
  
  <p>New Balance = 15</p>
  
  <p>Table After Update:</p>
  
  <pre><code>Name    Balance
  User1   25
  </code></pre>
  
  <p><b>Note:</b> I want without select the old balance row in the table</p>
  
  <p>Any one help?</p>