/// <summary>
            /// Update cell's style.
            /// </summary>
            /// <param name="name">The workbook name.</param>
            /// <param name="sheetName">The worksheet name.</param>
            /// <param name="cellName">The cell name.</param>
            /// <param name="style">WorkbookStyle</param>
            /// <param name="folder">The workbook folder.</param>
            /// <param name="storage">Workbook storage.</param>
            public void UpdateCellStyle(string name, string sheetName, string cellName, WorkbookStyle style, string folder, string storage = "")
            {
                // POST 	cells/{name}/worksheets/{sheetName}/cells/{cellName}/style?appSid={appSid}&storage={storage}&folder={folder} 

                string apiUrl = string.Format(@"cells/{0}/worksheets/{1}/cells/{2}/style?storage={3}&folder={4}",
                                                name, sheetName, cellName, storage, folder);

                ServiceController.Post(apiUrl, AppSid, AppKey, JsonConvert.SerializeObject(style));
            }
            /// <summary>
            /// Update style for pivot table 
            /// </summary>
            /// <param name="name">Document name.</param>
            /// <param name="sheetName">Worksheet name.</param>
            /// <param name="pivottableIndex">Pivot table index</param>
            /// <param name="style">WorkbookStyle object</param>
            /// <param name="folder">Document folder.</param>
            /// <param name="storage">The document storage.</param>
            public void UpdateStyleForPivotTable(string name, string sheetName, int pivotTableIndex, WorkbookStyle style, string folder, string storage = "")
            {
                //post  cells/{name}/worksheets/{sheetName}/pivottables/{pivotTableIndex}/FormatAll?appSid={appSid}&storage={storage}&folder={folder}

                string apiUrl = string.Format(@"cells/{0}/worksheets/{1}/pivottables/{2}/FormatAll?storage={3}&folder={4}", name, sheetName, pivotTableIndex, storage, folder);

                JObject jObject = JObject.Parse(ServiceController.Post(apiUrl, AppSid, AppKey, JsonConvert.SerializeObject(style)));
            }