public void CreateSnapshotMarshallTest()
        {
            var operation = service_model.FindOperation("CreateSnapshot");

            var request = InstantiateClassGenerator.Execute<CreateSnapshotRequest>();
            var marshaller = new CreateSnapshotRequestMarshaller();
            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();
            UnmarshallerContext context = new EC2UnmarshallerContext(Utils.CreateStreamFromString(payloadResponse), false, new WebResponseData());
            var response = CreateSnapshotResponseUnmarshaller.Instance.Unmarshall(context)
                as CreateSnapshotResponse;   
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);       
        }

        /// <summary>
        /// Creates a snapshot of an EBS volume and stores it in Amazon S3. You can use snapshots
        /// for backups, to make copies of EBS volumes, and to save data before shutting down
        /// an instance.
        /// 
        ///  
        /// <para>
        /// When a snapshot is created, any AWS Marketplace product codes that are associated
        /// with the source volume are propagated to the snapshot.
        /// </para>
        ///  
        /// <para>
        /// You can take a snapshot of an attached volume that is in use. However, snapshots only
        /// capture data that has been written to your EBS volume at the time the snapshot command
        /// is issued; this may exclude any data that has been cached by any applications or the
        /// operating system. If you can pause any file systems on the volume long enough to take
        /// a snapshot, your snapshot should be complete. However, if you cannot pause all file
        /// writes to the volume, you should unmount the volume from within the instance, issue
        /// the snapshot command, and then remount the volume to ensure a consistent and complete
        /// snapshot. You may remount and use your volume while the snapshot status is <code>pending</code>.
        /// </para>
        ///  
        /// <para>
        /// To create a snapshot for EBS volumes that serve as root devices, you should stop the
        /// instance before taking the snapshot.
        /// </para>
        ///  
        /// <para>
        /// Snapshots that are taken from encrypted volumes are automatically encrypted. Volumes
        /// that are created from encrypted snapshots are also automatically encrypted. Your encrypted
        /// volumes and any associated snapshots always remain protected.
        /// </para>
        ///  
        /// <para>
        /// For more information, see <a href="http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AmazonEBS.html">Amazon
        /// Elastic Block Store</a> and <a href="http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.html">Amazon
        /// EBS Encryption</a> in the <i>Amazon Elastic Compute Cloud User Guide</i>.
        /// </para>
        /// </summary>
        /// <param name="request">Container for the necessary parameters to execute the CreateSnapshot service method.</param>
        /// 
        /// <returns>The response from the CreateSnapshot service method, as returned by EC2.</returns>
        public CreateSnapshotResponse CreateSnapshot(CreateSnapshotRequest request)
        {
            var marshaller = new CreateSnapshotRequestMarshaller();
            var unmarshaller = CreateSnapshotResponseUnmarshaller.Instance;

            return Invoke<CreateSnapshotRequest,CreateSnapshotResponse>(request, marshaller, unmarshaller);
        }

        /// <summary>
        /// Initiates the asynchronous execution of the CreateSnapshot operation.
        /// </summary>
        /// 
        /// <param name="request">Container for the necessary parameters to execute the CreateSnapshot 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<CreateSnapshotResponse> CreateSnapshotAsync(CreateSnapshotRequest request, System.Threading.CancellationToken cancellationToken = default(CancellationToken))
        {
            var marshaller = new CreateSnapshotRequestMarshaller();
            var unmarshaller = CreateSnapshotResponseUnmarshaller.Instance;

            return InvokeAsync<CreateSnapshotRequest,CreateSnapshotResponse>(request, marshaller, 
                unmarshaller, cancellationToken);
        }

        /// <summary>
        /// Initiates the asynchronous execution of the CreateSnapshot operation.
        /// </summary>
        /// 
        /// <param name="request">Container for the necessary parameters to execute the CreateSnapshot operation on AmazonStorageGatewayClient.</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 EndCreateSnapshot
        ///         operation.</returns>
        public IAsyncResult BeginCreateSnapshot(CreateSnapshotRequest request, AsyncCallback callback, object state)
        {
            var marshaller = new CreateSnapshotRequestMarshaller();
            var unmarshaller = CreateSnapshotResponseUnmarshaller.Instance;

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

        /// <summary>
        /// Initiates the asynchronous execution of the CreateSnapshot operation.
        /// <seealso cref="Amazon.StorageGateway.IAmazonStorageGateway.CreateSnapshot"/>
        /// </summary>
        /// 
        /// <param name="request">Container for the necessary parameters to execute the CreateSnapshot 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<CreateSnapshotResponse> CreateSnapshotAsync(CreateSnapshotRequest request, CancellationToken cancellationToken = default(CancellationToken))
        {
            var marshaller = new CreateSnapshotRequestMarshaller();
            var unmarshaller = CreateSnapshotResponseUnmarshaller.GetInstance();
            return Invoke<IRequest, CreateSnapshotRequest, CreateSnapshotResponse>(request, marshaller, unmarshaller, signer, cancellationToken);
        }

        public void CreateSnapshotMarshallTest()
        {
            var request = InstantiateClassGenerator.Execute<CreateSnapshotRequest>();
            var marshaller = new CreateSnapshotRequestMarshaller();

            var internalRequest = marshaller.Marshall(request);
            var jsonRequest = UTF8Encoding.UTF8.GetString(internalRequest.Content);                        
            Comparer.CompareObjectToJson<CreateSnapshotRequest>(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("CreateSnapshot").ResponseStructure).Execute();
            webResponse.Headers.Add("Content-Length", UTF8Encoding.UTF8.GetBytes(jsonResponse).Length.ToString());
            UnmarshallerContext context = new JsonUnmarshallerContext(Utils.CreateStreamFromString(jsonResponse), false, webResponse);
            var response = CreateSnapshotResponseUnmarshaller.Instance.Unmarshall(context)
                as CreateSnapshotResponse;
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);
        }

 IAsyncResult invokeCreateSnapshot(CreateSnapshotRequest createSnapshotRequest, AsyncCallback callback, object state, bool synchronized)
 {
     IRequest irequest = new CreateSnapshotRequestMarshaller().Marshall(createSnapshotRequest);
     var unmarshaller = CreateSnapshotResponseUnmarshaller.GetInstance();
     AsyncResult result = new AsyncResult(irequest, callback, state, synchronized, signer, unmarshaller);
     Invoke(result);
     return result;
 }

        /// <summary>
        /// Initiates the asynchronous execution of the CreateSnapshot operation.
        /// <seealso cref="Amazon.EC2.IAmazonEC2.CreateSnapshot"/>
        /// </summary>
        /// 
        /// <param name="request">Container for the necessary parameters to execute the CreateSnapshot 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<CreateSnapshotResponse> CreateSnapshotAsync(CreateSnapshotRequest request, CancellationToken cancellationToken = default(CancellationToken))
        {
            var marshaller = new CreateSnapshotRequestMarshaller();
            var unmarshaller = CreateSnapshotResponseUnmarshaller.GetInstance();
            var response = await Invoke<IRequest, CreateSnapshotRequest, CreateSnapshotResponse>(request, marshaller, unmarshaller, signer, cancellationToken)
                .ConfigureAwait(continueOnCapturedContext: false);
            return response;
        }