title: Checking if container and blob exist in Azure Blob Storage using built in Exists method
body: <p>I found this extension method to check Blob storage exists</p>
  
  <p><a href="http://blog.smarx.com/posts/testing-existence-of-a-windows-azure-blob" rel="nofollow noreferrer">Testing Existence of a Windows Azure Blob</a></p>
  
  <p><a href="https://stackoverflow.com/q/2642919/296861">Checking if a blob exists in Azure Storage</a></p>
  
  <p>However, I found similar build in utility methods inside <code>Microsoft.WindowsAzure.Storage</code>.</p>
  
  <ul>
  <li><code>CloudBlobContainer.Exists</code> </li>
  <li><code>CloudBlockBlob.Exists</code></li>
  </ul>
  
  <p>As far as I tested, they function similar to the extension method. </p>
  
  <h2>Question:</h2>
  
  <p>Are they new utility methods? Should I use build in <code>Exists</code> method or use custom extension method.</p>