private string GenerateAllocationReportAsCsvFile(string appTempDirectory)
        {
            logger.Info("Generate CSV file for the attachment");
            string        filePath     = "";
            StringBuilder recordString = new StringBuilder($"Employee ID,Employee Name,Primary Skills,Secondary Skills,Business Unit,Project Name,Account Name,Allocation Type,Allocation Start Date,Allocation End Date,Project Manager,Comments{Environment.NewLine}");

            try
            {
                List <BillabilityWiseAllocationDetailDto> detailsDtos = allocationService.GetBillabilityWiseAllocationDetail("all", "all").ToList();
                foreach (BillabilityWiseAllocationDetailDto dto in detailsDtos)
                {
                    recordString.Append($"{dto.EmployeeID},");
                    recordString.Append($"{dto.EmployeeName},");
                    recordString.Append($"{dto.PrimarySkills?.Replace(",", "")},");
                    recordString.Append($"{dto.SecondarySkills?.Replace(",", "")},");
                    recordString.Append($"{dto.BusinessUnit},");
                    recordString.Append($"{dto.ProjectName},");
                    recordString.Append($"{dto.AccountName},");
                    recordString.Append($"{dto.AllocationType},");
                    recordString.Append($"{dto.AllocationStartDate?.ToString("dd/MMM/yyyy")},");
                    recordString.Append($"{dto.AllocationEndDate?.ToString("dd/MMM/yyyy")},");
                    recordString.Append($"{dto.ProjectManager},");
                    recordString.Append($"{dto.Comments}{Environment.NewLine}");
                }


                string fileName = $"ResourceAllocationReport-AsOn-{DateTime.Today.Year}-{DateTime.Today.Month}-{DateTime.Today.Day}.csv";
                filePath = FilesHandler.CreateFile(appTempDirectory, fileName, recordString.ToString());
            }
            catch (Exception exp)
            {
                logger.Error("Error while generating CSV file", exp);
            }

            return(filePath);
        }