title: Azure block BLOB ETag is null
body: <p>I've a BLOB container in Azure where I've saved some block BLOBs. The following code is a method to read a specific BLOB, I would save in a variable the BLOB ETag but it returns always null.</p>
  
  <pre><code>public static string DownloadAsText(string ContainerName, string BlobName, out string ETag)
  {
      CloudBlobContainer BlobContainer = CreateCloudBlobClient().GetContainerReference(ContainerName);
      CloudBlockBlob Blob = BlobContainer.GetBlockBlobReference(BlobName);
      ETag = Blob.Properties.ETag;
      return Blob.DownloadText();
  }
  </code></pre>