/// <summary>
        /// Gets a reply.
        /// Documentation https://developers.google.com/drive/v2/reference/replies/get
        /// Generation Note: This does not always build corectly.  Google needs to standardise things I need to figuer out which ones are wrong.
        /// </summary>
        /// <param name="service">Authenticated Drive service.</param>
        /// <param name="fileId">The ID of the file.</param>
        /// <param name="commentId">The ID of the comment.</param>
        /// <param name="replyId">The ID of the reply.</param>
        /// <param name="optional">Optional paramaters.</param>
        /// <returns>CommentReplyResponse</returns>
        public static CommentReply Get(DriveService service, string fileId, string commentId, string replyId, RepliesGetOptionalParms optional = null)
        {
            try
            {
                // Initial validation.
                if (service == null)
                {
                    throw new ArgumentNullException("service");
                }
                if (fileId == null)
                {
                    throw new ArgumentNullException(fileId);
                }
                if (commentId == null)
                {
                    throw new ArgumentNullException(commentId);
                }
                if (replyId == null)
                {
                    throw new ArgumentNullException(replyId);
                }

                // Building the initial request.
                var request = service.Replies.Get(fileId, commentId, replyId);

                // Applying optional parameters to the request.
                request = (RepliesResource.GetRequest)SampleHelpers.ApplyOptionalParms(request, optional);

                // Requesting data.
                return(request.Execute());
            }
            catch (Exception ex)
            {
                throw new Exception("Request Replies.Get failed.", ex);
            }
        }