public static DataVirtualHardDisk GetDataDisk(this IServiceManagement proxy,
                                               string subscriptionId,
                                               string serviceName,
                                               string deploymentName,
                                               string roleName,
                                               int lun)
 {
     return(proxy.EndGetDataDisk(
                proxy.BeginGetDataDisk(subscriptionId,
                                       serviceName,
                                       deploymentName,
                                       roleName,
                                       lun.ToString(),
                                       null,
                                       null)));
 }