LeaseBlob

public void LeaseBlob(String containerName, String blobName)
{
    String requestMethod = "PUT";

    String urlPath = String.Format("{0}/{1}?comp=lease", containerName, blobName);
    String modifiedUrlPath = String.Format("{0}/{1}\ncomp:lease", containerName, blobName);

    const Int32 contentLength = 0;

    String storageServiceVersion = "2012-02-12";
    String dateInRfc1123Format = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
    String leaseAction = "acquire";
    String leaseDuration = "60";
    String canonicalizedHeaders = String.Format(
            "x-ms-date:{0}\nx-ms-lease-action:{1}\nx-ms-lease-duration:{2}\nx-ms-version:{3}",
            dateInRfc1123Format,
            leaseAction,
            leaseDuration,
            storageServiceVersion);
    String canonicalizedResource = String.Format("/{0}/{1}", AzureStorageConstants.Account, modifiedUrlPath);
    String stringToSign = String.Format(
            "{0}\n\n\n{1}\n\n\n\n\n\n\n\n\n{2}\n{3}",
            requestMethod,
            contentLength,
            canonicalizedHeaders,
            canonicalizedResource);
    String authorizationHeader = Utility.CreateAuthorizationHeader(stringToSign);

    Uri uri = new Uri(AzureStorageConstants.BlobEndPoint + urlPath);
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    request.Method = requestMethod;
    request.Headers.Add("x-ms-date", dateInRfc1123Format);
    request.Headers.Add("x-ms-lease-action", leaseAction);
    request.Headers.Add("x-ms-lease-duration", leaseDuration);
    request.Headers.Add("x-ms-version", storageServiceVersion);
    request.Headers.Add("Authorization", authorizationHeader);
    request.ContentLength = contentLength;

    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    {
        String leaseId = response.Headers["x-ms-lease-id"];
    }
}