diff --git a/modules/openapi-generator/src/main/resources/csharp/ApiClient.mustache b/modules/openapi-generator/src/main/resources/csharp/ApiClient.mustache
index a919c37996f..a7e61ede4d5 100644
--- a/modules/openapi-generator/src/main/resources/csharp/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/csharp/ApiClient.mustache
@@ -454,7 +454,8 @@ namespace {{packageName}}.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -566,7 +567,8 @@ namespace {{packageName}}.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/modules/openapi-generator/src/main/resources/csharp/Configuration.mustache b/modules/openapi-generator/src/main/resources/csharp/Configuration.mustache
index 0a1051aba21..df392bfafa2 100644
--- a/modules/openapi-generator/src/main/resources/csharp/Configuration.mustache
+++ b/modules/openapi-generator/src/main/resources/csharp/Configuration.mustache
@@ -75,6 +75,8 @@ namespace {{packageName}}.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -246,11 +248,21 @@ namespace {{packageName}}.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -702,6 +714,7 @@ namespace {{packageName}}.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/modules/openapi-generator/src/main/resources/csharp/IReadableConfiguration.mustache b/modules/openapi-generator/src/main/resources/csharp/IReadableConfiguration.mustache
index 3d364834a62..7402c7bb07c 100644
--- a/modules/openapi-generator/src/main/resources/csharp/IReadableConfiguration.mustache
+++ b/modules/openapi-generator/src/main/resources/csharp/IReadableConfiguration.mustache
@@ -123,6 +123,11 @@ namespace {{packageName}}.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/ApiClient.cs
index 4706ebce003..891f0c97b13 100644
--- a/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -453,7 +453,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -548,7 +549,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/Configuration.cs
index dbdae28ff5a..ec5b2271426 100644
--- a/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/Configuration.cs
@@ -70,6 +70,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -175,11 +177,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -579,6 +591,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index 78076a6d500..a21807ea0ba 100644
--- a/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -99,6 +99,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ApiClient.cs
index b488b996d08..288b0f1dd8c 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -454,7 +454,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -563,7 +564,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/Configuration.cs
index cefd8d4c4e9..33f5ea156b3 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/Configuration.cs
@@ -71,6 +71,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -276,11 +278,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -718,6 +730,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index c9615dc5aa7..731589d5772 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -124,6 +124,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/Configuration.cs
index d2f3cee763b..64032c82021 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/Configuration.cs
@@ -70,6 +70,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -275,11 +277,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -689,6 +701,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index b99a151e5bb..2f15d38d1fc 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -99,6 +99,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ApiClient.cs
index 660dcd3a055..2defdd5b1f6 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -455,7 +455,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -564,7 +565,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/Configuration.cs
index d2244a7cdb2..00b52bc32e0 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/Configuration.cs
@@ -76,6 +76,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -281,11 +283,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -723,6 +735,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index c9615dc5aa7..731589d5772 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -124,6 +124,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/ApiClient.cs
index 660dcd3a055..2defdd5b1f6 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -455,7 +455,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -564,7 +565,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/Configuration.cs
index d2244a7cdb2..00b52bc32e0 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/Configuration.cs
@@ -76,6 +76,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -281,11 +283,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -723,6 +735,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index c9615dc5aa7..731589d5772 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net48/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -124,6 +124,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ApiClient.cs
index 660dcd3a055..2defdd5b1f6 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -455,7 +455,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -564,7 +565,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/Configuration.cs
index d2244a7cdb2..00b52bc32e0 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/Configuration.cs
@@ -76,6 +76,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -281,11 +283,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -723,6 +735,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index c9615dc5aa7..731589d5772 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -124,6 +124,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/Configuration.cs
index d2f3cee763b..64032c82021 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/Configuration.cs
@@ -70,6 +70,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -275,11 +277,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -689,6 +701,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index b99a151e5bb..2f15d38d1fc 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -99,6 +99,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/ApiClient.cs
index b488b996d08..288b0f1dd8c 100644
--- a/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -454,7 +454,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -563,7 +564,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/Configuration.cs
index cefd8d4c4e9..33f5ea156b3 100644
--- a/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/Configuration.cs
@@ -71,6 +71,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -276,11 +278,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -718,6 +730,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index c9615dc5aa7..731589d5772 100644
--- a/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -124,6 +124,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/ApiClient.cs
index 660dcd3a055..2defdd5b1f6 100644
--- a/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -455,7 +455,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -564,7 +565,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/Configuration.cs
index d2244a7cdb2..00b52bc32e0 100644
--- a/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/Configuration.cs
@@ -76,6 +76,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -281,11 +283,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -723,6 +735,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index c9615dc5aa7..731589d5772 100644
--- a/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClientCore/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -124,6 +124,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>
diff --git a/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ApiClient.cs b/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ApiClient.cs
index 3d9182b8906..4a8d8db7e22 100644
--- a/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ApiClient.cs
+++ b/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ApiClient.cs
@@ -454,7 +454,8 @@ namespace Org.OpenAPITools.Client
                 CookieContainer = cookies,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials        
             };
 
             RestClient client = new RestClient(clientOptions)
@@ -563,7 +564,8 @@ namespace Org.OpenAPITools.Client
                 ClientCertificates = configuration.ClientCertificates,
                 MaxTimeout = configuration.Timeout,
                 Proxy = configuration.Proxy,
-                UserAgent = configuration.UserAgent
+                UserAgent = configuration.UserAgent,
+                UseDefaultCredentials = configuration.UseDefaultCredentials
             };
 
             RestClient client = new RestClient(clientOptions)
diff --git a/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/Configuration.cs b/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/Configuration.cs
index 48962e561e5..91f5496b31d 100644
--- a/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/Configuration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/Configuration.cs
@@ -71,6 +71,8 @@ namespace Org.OpenAPITools.Client
         /// </summary>
         private string _basePath;
 
+        private bool _useDefaultCredentials = false;
+
         /// <summary>
         /// Gets or sets the API key based on the authentication name.
         /// This is the key and value comprising the "secret" for accessing an API.
@@ -176,11 +178,21 @@ namespace Org.OpenAPITools.Client
         /// <summary>
         /// Gets or sets the base path for API access.
         /// </summary>
-        public virtual string BasePath {
+        public virtual string BasePath 
+        {
             get { return _basePath; }
             set { _basePath = value; }
         }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        public virtual bool UseDefaultCredentials
+        {
+            get { return _useDefaultCredentials; }
+            set { _useDefaultCredentials = value; }
+        }
+
         /// <summary>
         /// Gets or sets the default header.
         /// </summary>
@@ -608,6 +620,7 @@ namespace Org.OpenAPITools.Client
                 TempFolderPath = second.TempFolderPath ?? first.TempFolderPath,
                 DateTimeFormat = second.DateTimeFormat ?? first.DateTimeFormat,
                 ClientCertificates = second.ClientCertificates ?? first.ClientCertificates,
+                UseDefaultCredentials = second.UseDefaultCredentials
             };
             return config;
         }
diff --git a/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs b/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
index e8d6b0bd392..bd78e6a567e 100644
--- a/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
+++ b/samples/client/petstore/csharp/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/IReadableConfiguration.cs
@@ -124,6 +124,11 @@ namespace Org.OpenAPITools.Client
         /// <value>Password.</value>
         string Password { get; }
 
+        /// <summary>
+        /// Determine whether or not the "default credentials" (e.g. the user account under which the current process is running) will be sent along to the server. The default is false.
+        /// </summary>
+        bool UseDefaultCredentials { get; }
+
         /// <summary>
         /// Get the servers associated with the operation.
         /// </summary>