view more number of images using c# return file action methos

var recordEventUploadFile = new RecordEventUploadFile();
           var ext="";
           var filePath = "";
           int i=0;
           var fileDetails = _reportReviewActionMethods.GetUploadFilePath(fileId);
           recordEventUploadFile.FilePath = fileDetails.FilePath;
           recordEventUploadFile.FileExtension = fileDetails.FileExtension;
           filePath = recordEventUploadFile.FilePath;
           var fileExtension = recordEventUploadFile.FileExtension;
           string[] ExtensionWODot = fileExtension.Split('.');
           if (ExtensionWODot[1].ToLower()== "pdf")
               ext = "application/" + ExtensionWODot[1].ToLower();
           else
           {
               ViewBag.ImagePath = fileDetails;
               return File(filePath, "image/" + ExtensionWODot[1].ToLower());
           }
           return File(filePath, ext);