public void CreateStackMarshallTest()
        {
            var operation = service_model.FindOperation("CreateStack");

            var request = InstantiateClassGenerator.Execute<CreateStackRequest>();
            var marshaller = new CreateStackRequestMarshaller();
            var internalRequest = marshaller.Marshall(request);
            var validator = new AWSQueryValidator(internalRequest.Parameters, request, service_model, operation);
            validator.Validate();


            var payloadResponse = new XmlSampleGenerator(service_model, operation).Execute();
            var context = new XmlUnmarshallerContext(Utils.CreateStreamFromString(payloadResponse), false, null);
            var response = CreateStackResponseUnmarshaller.Instance.Unmarshall(context)
                as CreateStackResponse;   
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);       
        }

        /// <summary>
        /// Initiates the asynchronous execution of the CreateStack operation.
        /// </summary>
        /// 
        /// <param name="request">Container for the necessary parameters to execute the CreateStack operation.</param>
        /// <param name="cancellationToken">
        ///     A cancellation token that can be used by other objects or threads to receive notice of cancellation.
        /// </param>
        /// <returns>The task object representing the asynchronous operation.</returns>
        public Task<CreateStackResponse> CreateStackAsync(CreateStackRequest request, System.Threading.CancellationToken cancellationToken = default(CancellationToken))
        {
            var marshaller = new CreateStackRequestMarshaller();
            var unmarshaller = CreateStackResponseUnmarshaller.Instance;

            return InvokeAsync<CreateStackRequest,CreateStackResponse>(request, marshaller, 
                unmarshaller, cancellationToken);
        }

        internal CreateStackResponse CreateStack(CreateStackRequest request)
        {
            var marshaller = new CreateStackRequestMarshaller();
            var unmarshaller = CreateStackResponseUnmarshaller.Instance;

            return Invoke<CreateStackRequest,CreateStackResponse>(request, marshaller, unmarshaller);
        }

 IAsyncResult invokeCreateStack(CreateStackRequest createStackRequest, AsyncCallback callback, object state, bool synchronized)
 {
     IRequest irequest = new CreateStackRequestMarshaller().Marshall(createStackRequest);
     var unmarshaller = CreateStackResponseUnmarshaller.GetInstance();
     AsyncResult result = new AsyncResult(irequest, callback, state, synchronized, signer, unmarshaller);
     Invoke(result);
     return result;
 }

        public void CreateStackMarshallTest()
        {
            var request = InstantiateClassGenerator.Execute<CreateStackRequest>();
            var marshaller = new CreateStackRequestMarshaller();

            var internalRequest = marshaller.Marshall(request);
            var jsonRequest = UTF8Encoding.UTF8.GetString(internalRequest.Content);                        
            Comparer.CompareObjectToJson<CreateStackRequest>(request,jsonRequest);

            var webResponse = new WebResponseData
            {
                Headers = {
                    {"x-amzn-RequestId", Guid.NewGuid().ToString()},
                    {"x-amz-crc32","0"}
                }
            };
            var jsonResponse = new JsonSampleGenerator(service_model, service_model.FindOperation("CreateStack").ResponseStructure).Execute();
            webResponse.Headers.Add("Content-Length", UTF8Encoding.UTF8.GetBytes(jsonResponse).Length.ToString());
            UnmarshallerContext context = new JsonUnmarshallerContext(Utils.CreateStreamFromString(jsonResponse), false, webResponse);
            var response = CreateStackResponseUnmarshaller.Instance.Unmarshall(context)
                as CreateStackResponse;
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);
        }

        /// <summary>
        /// Initiates the asynchronous execution of the CreateStack operation.
        /// </summary>
        /// 
        /// <param name="request">Container for the necessary parameters to execute the CreateStack operation on AmazonCloudFormationClient.</param>
        /// <param name="callback">An AsyncCallback delegate that is invoked when the operation completes.</param>
        /// <param name="state">A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback
        ///          procedure using the AsyncState property.</param>
        /// 
        /// <returns>An IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking EndCreateStack
        ///         operation.</returns>
        public IAsyncResult BeginCreateStack(CreateStackRequest request, AsyncCallback callback, object state)
        {
            var marshaller = new CreateStackRequestMarshaller();
            var unmarshaller = CreateStackResponseUnmarshaller.Instance;

            return BeginInvoke<CreateStackRequest>(request, marshaller, unmarshaller,
                callback, state);
        }

        /// <summary>
        /// <para>Creates a stack as specified in the template. After the call completes successfully, the stack creation starts. You can check the
        /// status of the stack via the DescribeStacks API.</para> <para><b>NOTE:</b> Currently, the limit for stacks is 20 stacks per account per
        /// region. </para>
        /// </summary>
        /// 
        /// <param name="createStackRequest">Container for the necessary parameters to execute the CreateStack service method on
        /// AmazonCloudFormation.</param>
        /// 
        /// <returns>The response from the CreateStack service method, as returned by AmazonCloudFormation.</returns>
        /// 
        /// <exception cref="T:Amazon.CloudFormation.Model.AlreadyExistsException" />
        /// <exception cref="T:Amazon.CloudFormation.Model.LimitExceededException" />
        /// <exception cref="T:Amazon.CloudFormation.Model.InsufficientCapabilitiesException" />
        /// <param name="cancellationToken">
        ///     A cancellation token that can be used by other objects or threads to receive notice of cancellation.
        /// </param>
		public Task<CreateStackResponse> CreateStackAsync(CreateStackRequest createStackRequest, CancellationToken cancellationToken = default(CancellationToken))
        {
            var marshaller = new CreateStackRequestMarshaller();
            var unmarshaller = CreateStackResponseUnmarshaller.GetInstance();
            return Invoke<IRequest, CreateStackRequest, CreateStackResponse>(createStackRequest, marshaller, unmarshaller, signer, cancellationToken);
        }

  /// <summary>
  /// <para> Creates a stack as specified in the template. After the call completes successfully, the stack creation starts. You can check the
  /// status of the stack via the DescribeStacks API. </para> <para><b>NOTE:</b> Currently, the limit for stacks is 20 stacks per account per
  /// region. </para>
  /// </summary>
  /// 
  /// <param name="createStackRequest">Container for the necessary parameters to execute the CreateStack service method on
  ///           AmazonCloudFormation.</param>
  /// 
  /// <returns>The response from the CreateStack service method, as returned by AmazonCloudFormation.</returns>
  /// 
  /// <exception cref="AlreadyExistsException"/>
  /// <exception cref="LimitExceededException"/>
 public CreateStackResponse CreateStack(CreateStackRequest createStackRequest) 
 {           
     IRequest<CreateStackRequest> request = new CreateStackRequestMarshaller().Marshall(createStackRequest);
     CreateStackResponse response = Invoke<CreateStackRequest, CreateStackResponse> (request, this.signer, CreateStackResponseUnmarshaller.GetInstance());
     return response;
 }

        IAsyncResult invokeCreateStack(CreateStackRequest request, AsyncCallback callback, object state, bool synchronized)
        {
            var marshaller = new CreateStackRequestMarshaller();
            var unmarshaller = CreateStackResponseUnmarshaller.Instance;

            return Invoke(request, callback, state, synchronized, marshaller, unmarshaller, signer);
        }

        /// <summary>
        /// Initiates the asynchronous execution of the CreateStack operation.
        /// <seealso cref="Amazon.CloudFormation.IAmazonCloudFormation.CreateStack"/>
        /// </summary>
        /// 
        /// <param name="request">Container for the necessary parameters to execute the CreateStack operation.</param>
        /// <param name="cancellationToken">
        ///     A cancellation token that can be used by other objects or threads to receive notice of cancellation.
        /// </param>
        /// <returns>The task object representing the asynchronous operation.</returns>
		public async Task<CreateStackResponse> CreateStackAsync(CreateStackRequest request, CancellationToken cancellationToken = default(CancellationToken))
        {
            var marshaller = new CreateStackRequestMarshaller();
            var unmarshaller = CreateStackResponseUnmarshaller.GetInstance();
            var response = await Invoke<IRequest, CreateStackRequest, CreateStackResponse>(request, marshaller, unmarshaller, signer, cancellationToken)
                .ConfigureAwait(continueOnCapturedContext: false);
            return response;
        }