diff --git a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/_event_hub_management_client.py b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/_event_hub_management_client.py
index 71f81d87eed5..8da585974838 100644
--- a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/_event_hub_management_client.py
+++ b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/_event_hub_management_client.py
@@ -70,6 +70,7 @@ def __init__(
         super(EventHubManagementClient, self).__init__(self.config.credentials, self.config)
 
         client_models = {k: v for k, v in models.__dict__.items() if isinstance(v, type)}
+        self.api_version = '2018-01-01-preview'
         self._serialize = Serializer(client_models)
         self._deserialize = Deserializer(client_models)
 
diff --git a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_consumer_groups_operations.py b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_consumer_groups_operations.py
index 7f815a3f2ec8..4fbccfece59e 100644
--- a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_consumer_groups_operations.py
+++ b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_consumer_groups_operations.py
@@ -24,7 +24,7 @@ class ConsumerGroupsOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: Client API Version. Constant value: "2017-04-01".
+    :ivar api_version: Client API Version. Constant value: "2018-01-01-preview".
     """
 
     models = models
@@ -34,7 +34,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2017-04-01"
+        self.api_version = "2018-01-01-preview"
 
         self.config = config
 
diff --git a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_disaster_recovery_configs_operations.py b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_disaster_recovery_configs_operations.py
index de5885f24913..1c77593e89ae 100644
--- a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_disaster_recovery_configs_operations.py
+++ b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_disaster_recovery_configs_operations.py
@@ -24,7 +24,7 @@ class DisasterRecoveryConfigsOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: Client API Version. Constant value: "2017-04-01".
+    :ivar api_version: Client API Version. Constant value: "2018-01-01-preview".
     """
 
     models = models
@@ -34,7 +34,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2017-04-01"
+        self.api_version = "2018-01-01-preview"
 
         self.config = config
 
diff --git a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_event_hubs_operations.py b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_event_hubs_operations.py
index a5f6a3dffdc4..6073197879c8 100644
--- a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_event_hubs_operations.py
+++ b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_event_hubs_operations.py
@@ -24,7 +24,7 @@ class EventHubsOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: Client API Version. Constant value: "2017-04-01".
+    :ivar api_version: Client API Version. Constant value: "2018-01-01-preview".
     """
 
     models = models
@@ -34,7 +34,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2017-04-01"
+        self.api_version = "2018-01-01-preview"
 
         self.config = config
 
diff --git a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_namespaces_operations.py b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_namespaces_operations.py
index 684edce51763..a5e4d40d4728 100644
--- a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_namespaces_operations.py
+++ b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_namespaces_operations.py
@@ -26,6 +26,7 @@ class NamespacesOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
+    :ivar api_version: Client API Version. Constant value: "2018-01-01-preview".
     """
 
     models = models
@@ -35,6 +36,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
+        self.api_version = "2018-01-01-preview"
 
         self.config = config
 
@@ -58,8 +60,6 @@ def list_ip_filter_rules(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         def prepare_request(next_link=None):
             if not next_link:
                 # Construct URL
@@ -73,7 +73,7 @@ def prepare_request(next_link=None):
 
                 # Construct parameters
                 query_parameters = {}
-                query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+                query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
             else:
                 url = next_link
@@ -137,8 +137,6 @@ def create_or_update_ip_filter_rule(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.create_or_update_ip_filter_rule.metadata['url']
         path_format_arguments = {
@@ -151,7 +149,7 @@ def create_or_update_ip_filter_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -206,8 +204,6 @@ def delete_ip_filter_rule(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.delete_ip_filter_rule.metadata['url']
         path_format_arguments = {
@@ -220,7 +216,7 @@ def delete_ip_filter_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -265,8 +261,6 @@ def get_ip_filter_rule(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.get_ip_filter_rule.metadata['url']
         path_format_arguments = {
@@ -279,7 +273,7 @@ def get_ip_filter_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -325,8 +319,6 @@ def list(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         def prepare_request(next_link=None):
             if not next_link:
                 # Construct URL
@@ -338,7 +330,7 @@ def prepare_request(next_link=None):
 
                 # Construct parameters
                 query_parameters = {}
-                query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+                query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
             else:
                 url = next_link
@@ -395,8 +387,6 @@ def list_by_resource_group(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         def prepare_request(next_link=None):
             if not next_link:
                 # Construct URL
@@ -409,7 +399,7 @@ def prepare_request(next_link=None):
 
                 # Construct parameters
                 query_parameters = {}
-                query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+                query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
             else:
                 url = next_link
@@ -451,8 +441,6 @@ def internal_paging(next_link=None):
 
     def _create_or_update_initial(
             self, resource_group_name, namespace_name, parameters, custom_headers=None, raw=False, **operation_config):
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.create_or_update.metadata['url']
         path_format_arguments = {
@@ -464,7 +452,7 @@ def _create_or_update_initial(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -557,8 +545,6 @@ def get_long_running_output(response):
 
     def _delete_initial(
             self, resource_group_name, namespace_name, custom_headers=None, raw=False, **operation_config):
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.delete.metadata['url']
         path_format_arguments = {
@@ -570,7 +556,7 @@ def _delete_initial(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -656,8 +642,6 @@ def get(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.get.metadata['url']
         path_format_arguments = {
@@ -669,7 +653,7 @@ def get(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -725,8 +709,6 @@ def update(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.update.metadata['url']
         path_format_arguments = {
@@ -738,7 +720,7 @@ def update(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -794,8 +776,6 @@ def list_virtual_network_rules(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         def prepare_request(next_link=None):
             if not next_link:
                 # Construct URL
@@ -809,7 +789,7 @@ def prepare_request(next_link=None):
 
                 # Construct parameters
                 query_parameters = {}
-                query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+                query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
             else:
                 url = next_link
@@ -875,8 +855,6 @@ def create_or_update_virtual_network_rule(
         """
         parameters = models.VirtualNetworkRule(virtual_network_subnet_id=virtual_network_subnet_id)
 
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.create_or_update_virtual_network_rule.metadata['url']
         path_format_arguments = {
@@ -889,7 +867,7 @@ def create_or_update_virtual_network_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -944,8 +922,6 @@ def delete_virtual_network_rule(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.delete_virtual_network_rule.metadata['url']
         path_format_arguments = {
@@ -958,7 +934,7 @@ def delete_virtual_network_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1004,8 +980,6 @@ def get_virtual_network_rule(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.get_virtual_network_rule.metadata['url']
         path_format_arguments = {
@@ -1018,7 +992,7 @@ def get_virtual_network_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1071,8 +1045,6 @@ def create_or_update_network_rule_set(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.create_or_update_network_rule_set.metadata['url']
         path_format_arguments = {
@@ -1084,7 +1056,7 @@ def create_or_update_network_rule_set(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1138,8 +1110,6 @@ def get_network_rule_set(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2018-01-01-preview"
-
         # Construct URL
         url = self.get_network_rule_set.metadata['url']
         path_format_arguments = {
@@ -1151,7 +1121,7 @@ def get_network_rule_set(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1201,8 +1171,6 @@ def list_authorization_rules(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2017-04-01"
-
         def prepare_request(next_link=None):
             if not next_link:
                 # Construct URL
@@ -1216,7 +1184,7 @@ def prepare_request(next_link=None):
 
                 # Construct parameters
                 query_parameters = {}
-                query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+                query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
             else:
                 url = next_link
@@ -1283,8 +1251,6 @@ def create_or_update_authorization_rule(
         """
         parameters = models.AuthorizationRule(rights=rights)
 
-        api_version = "2017-04-01"
-
         # Construct URL
         url = self.create_or_update_authorization_rule.metadata['url']
         path_format_arguments = {
@@ -1297,7 +1263,7 @@ def create_or_update_authorization_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1352,8 +1318,6 @@ def delete_authorization_rule(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2017-04-01"
-
         # Construct URL
         url = self.delete_authorization_rule.metadata['url']
         path_format_arguments = {
@@ -1366,7 +1330,7 @@ def delete_authorization_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1412,8 +1376,6 @@ def get_authorization_rule(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2017-04-01"
-
         # Construct URL
         url = self.get_authorization_rule.metadata['url']
         path_format_arguments = {
@@ -1426,7 +1388,7 @@ def get_authorization_rule(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1478,8 +1440,6 @@ def list_keys(
         :raises:
          :class:`ErrorResponseException<azure.mgmt.eventhub.v2018_01_01_preview.models.ErrorResponseException>`
         """
-        api_version = "2017-04-01"
-
         # Construct URL
         url = self.list_keys.metadata['url']
         path_format_arguments = {
@@ -1492,7 +1452,7 @@ def list_keys(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1554,8 +1514,6 @@ def regenerate_keys(
         """
         parameters = models.RegenerateAccessKeyParameters(key_type=key_type, key=key)
 
-        api_version = "2017-04-01"
-
         # Construct URL
         url = self.regenerate_keys.metadata['url']
         path_format_arguments = {
@@ -1568,7 +1526,7 @@ def regenerate_keys(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
@@ -1622,8 +1580,6 @@ def check_name_availability(
         """
         parameters = models.CheckNameAvailabilityParameter(name=name)
 
-        api_version = "2017-04-01"
-
         # Construct URL
         url = self.check_name_availability.metadata['url']
         path_format_arguments = {
@@ -1633,7 +1589,7 @@ def check_name_availability(
 
         # Construct parameters
         query_parameters = {}
-        query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
 
         # Construct headers
         header_parameters = {}
diff --git a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_operations.py b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_operations.py
index 174059d8d116..3bab22b10d2e 100644
--- a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_operations.py
+++ b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_operations.py
@@ -24,7 +24,7 @@ class Operations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: Client API Version. Constant value: "2017-04-01".
+    :ivar api_version: Client API Version. Constant value: "2018-01-01-preview".
     """
 
     models = models
@@ -34,7 +34,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2017-04-01"
+        self.api_version = "2018-01-01-preview"
 
         self.config = config
 
diff --git a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_regions_operations.py b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_regions_operations.py
index b1fb55fb3c86..c8f6784a0b6a 100644
--- a/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_regions_operations.py
+++ b/sdk/eventhub/azure-mgmt-eventhub/azure/mgmt/eventhub/v2018_01_01_preview/operations/_regions_operations.py
@@ -24,7 +24,7 @@ class RegionsOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: Client API Version. Constant value: "2017-04-01".
+    :ivar api_version: Client API Version. Constant value: "2018-01-01-preview".
     """
 
     models = models
@@ -34,7 +34,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2017-04-01"
+        self.api_version = "2018-01-01-preview"
 
         self.config = config