MS Dynamics CRM - Download document template as PDF - C#

The below method will download the document template as PDF and save it to specified folder

 DownloadDocumentTemplatePDF(service, "3c16ef12-f417-ea11-a811-000d3a339ac5", "80bc1f5d-f417-ea11-a811-000d3a339ac5", 10286);

  public static void DownloadDocumentTemplatePDF(IOrganizationService _service, string documentTemplateId, string recordId, int entityTypeCode)
        {            
            string documentTemplateName = "EmployeeDetails";         
           
            try
            {
                OrganizationRequest request = new OrganizationRequest("ExportPdfDocument");

                request["EntityTypeCode"] = entityTypeCode; 
                request["SelectedTemplate"] = new EntityReference("documenttemplate", new Guid(documentTemplateId)); 

                //serialize JSON array of the records
                List<Guid> records = new List<Guid> { new Guid(recordId) };
                request["SelectedRecords"] = JsonConvert.SerializeObject(records);

                OrganizationResponse pdfResponse = (OrganizationResponse)_service.Execute(request);

                //Write to file
                string b64File = Convert.ToBase64String((byte[])pdfResponse["PdfFile"]);
                File.WriteAllBytes(@"C:\Users\M1045533\Desktop\" + documentTemplateName + ".pdf", pdfResponse["PdfFile"] as byte[]);
                   

            }
            catch (Exception ex)
            {
                throw;
            }            
        }