public static void StartRoles(this IServiceManagement proxy,
                               string subscriptionId,
                               string serviceName,
                               string deploymentName,
                               StartRolesOperation startRolesOperation)
 {
     proxy.EndExecuteRoleSetOperation(proxy.BeginExecuteRoleSetOperation(
                                          subscriptionId,
                                          serviceName,
                                          deploymentName,
                                          startRolesOperation,
                                          null,
                                          null));
 }