private AzureAccount MergeAccountProperties(AzureAccount account1, AzureAccount account2)
        {
            if (account1 == null || account2 == null)
            {
                throw new ArgumentNullException("account1");
            }
            if (account1.Id != account2.Id)
            {
                throw new ArgumentException("Account1 Ids do not match.");
            }
            if (account1.Type != account2.Type)
            {
                throw new ArgumentException("Account1 types do not match.");
            }
            AzureAccount mergeAccount = new AzureAccount
            {
                Id = account1.Id,
                Type = account1.Type
            };

            // Merge all properties
            foreach (AzureAccount.Property property in Enum.GetValues(typeof(AzureAccount.Property)))
            {
                string propertyValue = account1.GetProperty(property) ?? account2.GetProperty(property);
                if (propertyValue != null)
                {
                    mergeAccount.Properties[property] = propertyValue;
                }
            }

            // Merge Tenants
            var tenants = account1.GetPropertyAsArray(AzureAccount.Property.Tenants)
                    .Union(account2.GetPropertyAsArray(AzureAccount.Property.Tenants), StringComparer.CurrentCultureIgnoreCase);

            mergeAccount.SetProperty(AzureAccount.Property.Tenants, tenants.ToArray());

            // Merge Subscriptions
            var subscriptions = account1.GetPropertyAsArray(AzureAccount.Property.Subscriptions)
                    .Union(account2.GetPropertyAsArray(AzureAccount.Property.Subscriptions), StringComparer.CurrentCultureIgnoreCase);

            mergeAccount.SetProperty(AzureAccount.Property.Subscriptions, subscriptions.ToArray());

            return mergeAccount;
        }
        private IEnumerable<AzureSubscription> ListServiceManagementSubscriptions(ref AzureAccount account, AzureEnvironment environment, SecureString password, ShowDialog promptBehavior)
        {
            List<AzureSubscription> result = new List<AzureSubscription>();

            if (!environment.IsEndpointSet(AzureEnvironment.Endpoint.ServiceManagement))
            {
                return result;
            }

            foreach (var tenant in account.GetPropertyAsArray(AzureAccount.Property.Tenants))
            {
                try
                {
                    var tenantToken = AzureSession.AuthenticationFactory.Authenticate(ref account, environment, tenant, password, ShowDialog.Never);

                    using (var subscriptionClient = AzureSession.ClientFactory.CreateCustomClient<WindowsAzure.Subscriptions.SubscriptionClient>(
                            new TokenCloudCredentials(tenantToken.AccessToken),
                            environment.GetEndpointAsUri(AzureEnvironment.Endpoint.ServiceManagement)))
                    {
                        var subscriptionListResult = subscriptionClient.Subscriptions.List();
                        foreach (var subscription in subscriptionListResult.Subscriptions)
                        {
                            AzureSubscription psSubscription = new AzureSubscription
                            {
                                Id = new Guid(subscription.SubscriptionId),
                                Name = subscription.SubscriptionName,
                                Environment = environment.Name
                            };
                            psSubscription.Properties[AzureSubscription.Property.SupportedModes] = AzureModule.AzureServiceManagement.ToString();
                            psSubscription.SetProperty(AzureSubscription.Property.Tenants, subscription.ActiveDirectoryTenantId);

                            AzureSession.SubscriptionTokenCache[Tuple.Create(psSubscription.Id, account.Id)] = tenantToken;

                            result.Add(psSubscription);
                        }
                    }
                }
                catch (CloudException cEx)
                {
                    WriteOrThrowAadExceptionMessage(cEx);
                }
                catch (AadAuthenticationException aadEx)
                {
                    WriteOrThrowAadExceptionMessage(aadEx);
                }
            }

            return result;
        }
        private IEnumerable<AzureSubscription> ListSubscriptionsFromServer(AzureAccount account, AzureEnvironment environment, SecureString password, ShowDialog promptBehavior)
        {
            string[] tenants = null;
            try
            {
                if (!account.IsPropertySet(AzureAccount.Property.Tenants))
                {
                    tenants = LoadAccountTenants(account, environment, password, promptBehavior);
                }
            }
            catch (AadAuthenticationException aadEx)
            {
                WriteOrThrowAadExceptionMessage(aadEx);
                return new AzureSubscription[0];
            }

            try
            {
                tenants = tenants ?? account.GetPropertyAsArray(AzureAccount.Property.Tenants);
                List<AzureSubscription> mergedSubscriptions = MergeSubscriptions(
                    ListServiceManagementSubscriptions(account, environment, password, ShowDialog.Never, tenants).ToList(),
                    ListResourceManagerSubscriptions(account, environment, password, ShowDialog.Never, tenants).ToList());

                // Set user ID
                foreach (var subscription in mergedSubscriptions)
                {
                    account.SetOrAppendProperty(AzureAccount.Property.Subscriptions, subscription.Id.ToString());
                }

                if (mergedSubscriptions.Any())
                {
                    return mergedSubscriptions;
                }
                else
                {
                    return new AzureSubscription[0];
                }
            }
            catch (AadAuthenticationException aadEx)
            {
                WriteOrThrowAadExceptionMessage(aadEx);
                return new AzureSubscription[0];
            }
        }