Load document from Azure Blob Storage Leave feedback

string blobName = "sample.pdf";
using (Annotator annotator = new Annotator(DownloadFile(blobName)))
{
	AreaAnnotation area = new AreaAnnotation()
	{
		Box = new Rectangle(100, 100, 100, 100),
		BackgroundColor = 65535,
	};
	annotator.Add(area);
	annotator.Save("result.pdf");
}

public static Stream DownloadFile(string blobName)
{
	CloudBlobContainer container = GetContainer();
	CloudBlob blob = container.GetBlobReference(blobName);
	MemoryStream memoryStream = new MemoryStream();
	blob.DownloadToStream(memoryStream);
	memoryStream.Position = 0;
	return memoryStream;
}

private static CloudBlobContainer GetContainer()
{
	string accountName = "***";
	string accountKey = "***";
	string endpoint = $"https://{accountName}.blob.core.windows.net/";
	string containerName = "***";
	StorageCredentials storageCredentials = new StorageCredentials(accountName, accountKey);
	CloudStorageAccount cloudStorageAccount = new CloudStorageAccount(
		storageCredentials, new Uri(endpoint), null, null, null);
	CloudBlobClient cloudBlobClient = cloudStorageAccount.CreateCloudBlobClient();
	CloudBlobContainer container = cloudBlobClient.GetContainerReference(containerName);
	container.CreateIfNotExists();
	return container;
}