How can I change the title of rdlc report in MVC

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MVC

RDLC

Hello,
I have an NBISIAReport.rdlc file in MVC and i want to change the title of the report like 'Bridge NBI SIA Report' but title comes like 'NBISIAReport' when i downloaded the report.

What I have tried:

[HttpPost]
        public ActionResult GenerateMultipleNBISIAReport(List<NBISIAReportViewModel> structures)
        {
            try
            {
                //var dirName = User.Identity.Name.Replace(" ", "");
                DateTime currDate = DateTime.Now;
                string dirName = "NBI-SIA_Reports" + "_" + currDate.ToString("MM") + "_" + currDate.ToString("dd") + "_" + currDate.ToString("yy") + "_" + currDate.ToString("HH") + "_" + currDate.ToString("mm");
                var reportFolderPath = Request.MapPath(Request.ApplicationPath) + "Downloads/" + dirName;
                const string fileExtension = "PDF";
                var zipFolderPath = reportFolderPath + "/" + dirName + ".zip";

                var exists = Directory.Exists(reportFolderPath);

                if (!exists)
                {
                    Directory.CreateDirectory(reportFolderPath);
                }
                else
                {
                    Directory.Delete(reportFolderPath, true);
                    Directory.CreateDirectory(reportFolderPath);
                }

                foreach (var structure in structures)
                {
                    if (structure.Id == null) continue;
                    string reportName;
                    string reportPath;
                    string reportTitle;

                    switch (structure.StrKindCode)
                    {
                        case "1":
                            reportPath = Request.MapPath(Request.ApplicationPath) + @"Reports\NBISIAReport.rdlc";
                            reportName = structure.StrNumber + "-Bridge.pdf";                           
                            break;
                        case "2":
                            reportPath = Request.MapPath(Request.ApplicationPath) + @"Reports\NBISIAReport.rdlc";
                            reportName = structure.StrNumber + "-Culvert.pdf";
                           
                            break;
                        case "3":
                            reportPath = Request.MapPath(Request.ApplicationPath) + @"Reports\NBISIAReport.rdlc";
                            reportName = structure.StrNumber + "-Tunnel.pdf";
                            
                            break;
                        case "4":
                            reportPath = Request.MapPath(Request.ApplicationPath) + @"Reports\NBISIAReport.rdlc";
                            reportName = structure.StrNumber + "-Trail.pdf";                           
                            break;
                        default:
                            reportPath = Request.MapPath(Request.ApplicationPath) + @"Reports\NBISIAReport.rdlc";
                            reportName = structure.StrNumber + "-Other.pdf";                            
                            break;
                    }

                    var localReport = new LocalReport
                    {
                        ReportPath = reportPath
                    };

                    var obj = new InspectionReportData();

                    var ds = obj.GetNBISIAReportData(Convert.ToInt32(structure.Id), AgencyCode);

                    localReport.DataSources.Add(new ReportDataSource("NBISIAReportDataSet", ds.Tables[0]));
                    localReport.DataSources.Add(new ReportDataSource("NBISIABIPReportDataSet", ds.Tables[1]));
                    localReport.EnableExternalImages = true;
                    localReport.DisplayName = reportTitle;

                    var renderByte = localReport.Render(fileExtension, "");

                   localReport.DisplayName='Bridge NBI SIA Report';

                    using (var fileStream = new FileStream(reportFolderPath + "/" + reportName, FileMode.Create))
                    {
                        fileStream.Write(renderByte, 0, renderByte.Length);
                    }
                }

                using (var zip = new ZipFile())
                {
                    zip.AddDirectory(reportFolderPath);
                    zip.Save(zipFolderPath);
                }

                dirName = string.Empty;

                return Json(new { success = true, filePath = zipFolderPath }, JsonRequestBehavior.AllowGet);
            }
            catch (Exception ex)
            {
                return Json(new { success = false, message = ex.Message }, JsonRequestBehavior.AllowGet);
            }
        }