public void Add(VirtualMachine vm)
 {
     MyVirtualMachines.Add(vm);
 }
        /// <summary>
        /// Returns a list of Permanent Virtual Machine roles. Each Virtual Machine object contains some metadata of the actual virtual machine
        /// </summary>
        /// <returns>A list of Permanent Virtual Machine Roles</returns>
        public VirtualMachines GetAllVirtualMachineRoles()
        {
            ComputeManagementClient client = new ComputeManagementClient(MyCloudCredentials);
            try
            {
                VirtualMachines vms = new VirtualMachines(new List<VirtualMachine>());
                var hostedServices = client.HostedServices.List();

                foreach (var service in hostedServices)
                {
                    var deployment = GetAzureDeyployment(service.ServiceName, DeploymentSlot.Production);
                    if (deployment != null)
                    {
                        if (deployment.Roles.Count > 0)
                        {
                            VirtualMachine vm = null;
                            foreach (var role in deployment.Roles)
                            {
                                if (role.RoleType == VirtualMachineRoleType.PersistentVMRole.ToString())
                                {
                                    var operatingSystem = string.Format("{0}--{1}",role.OSVirtualHardDisk.OperatingSystem, role.OSVirtualHardDisk.SourceImageName);
                                    var rate = Configuration.GetAzureRates().GetMyRate(role.RoleSize);
                                    vm = new VirtualMachine(role.RoleName, role.RoleSize, role.RoleType, operatingSystem, rate);
                                    vms.Add(vm);
                                }
                            }
                        }
                    }
                }
                return vms;
            }
            catch (CloudException ce)
            {
                Logger.Warn(ce, String.Format("Exception during retrieval of Virtual Machine Roles Exception: {0}", ce));
            }
            return null;
        }