public FileResult download(int?FieldViewId)
{
FileProperties fileProperties = publicationService.GetFileInformationById(FieldViewId);
string fileName = fileProperties.FileName;
string filePath = fileProperties.FilePath;
string fileText = System.IO.File.ReadAllText(filePath);
string contentType;
new FileExtensionContentTypeProvider().TryGetContentType(filePath, out contentType);
FileResult fr = File(Encoding.UTF8.GetBytes(fileText), "application/pdf", fileName);
return(fr);
}