public static AzureBlobDirectory GetBlobDirectory(this CloudBlobClient client, string folderName)
{
var parts = client.CutFolder(folderName);
var container = client.GetContainerReference(parts.ContainerName);
return(parts.Subfolder != null
? new AzureBlobDirectory(container, container.GetDirectoryReference(parts.Subfolder))
: new AzureBlobDirectory(container, null));
}