CloudBlob.DownloadToFile Method (String, BlobRequestOptions)

static void DownloadBlobToFile(Uri blobEndpoint, string accountName, string accountKey)
{
    // Create service client for credentialed access to the Blob service.
    CloudBlobClient blobClient = 
        new CloudBlobClient(blobEndpoint, new StorageCredentialsAccountAndKey(accountName, accountKey));

    // Return a reference to the blob.
    CloudBlob blob = blobClient.GetBlobReference("mycontainer/myblob");

    // Download the blob to a local file only if it has been modified since a fixed date.
    DateTime dt = new DateTime(2012, 1, 1, 0, 0, 0, DateTimeKind.Utc);

    try
    {
        blob.DownloadToFile("c:\\temp\\mylocalblob.txt", new BlobRequestOptions()
                {
                    AccessCondition = AccessCondition.IfModifiedSince(dt.ToUniversalTime())
                });
    }
    catch (StorageClientException e)
    {
        if (e.StatusCode == System.Net.HttpStatusCode.NotModified)
            Console.WriteLine("The blob was not modified since January 1, 2012.");
        else
            throw e; // some other StorageClientException, re-throw
    }
}