hot convert byte into pdf file

Hello

 

i tried to convert byte (which is store in table )into pdf file(download pdf file)

 

here is my code in mvc

 

pdf is genrated but not loaded

 

what is wrong in code

 

 

public FileResult DownloadPDF(string Id)
        {
            AttachFileSC mAttachFileSC = null;
            DataSet mDataSet = null;
            MemoryStream pdfStream = new MemoryStream();
            string FileName = string.Empty;
            try
            {
                mAttachFileSC = new AttachFileSC();
                FileManagerBLL mFileManagerBLL = new FMS.Models.BLL.FileManagerBLL();
                mDataSet = mFileManagerBLL.DownloadPDF(Id, UserObj.UserId);
                foreach (DataRow mDataRow in mDataSet.Tables[0].Rows)
                {
                    mAttachFileSC.FileName = mDataRow["FileName"].ToString();
                    mAttachFileSC.FileSize = mDataRow["FileSize"].ToString();
                    mAttachFileSC.FileExt = mDataRow["FileExt"].ToString();
                    mAttachFileSC.FileByte = (byte[])mDataSet.Tables[0].Rows[0]["FileByte"];
                }
                FileName = (mAttachFileSC.FileName).Replace(mAttachFileSC.FileExt, ".pdf");
                pdfStream.Write(mAttachFileSC.FileByte, 0, mAttachFileSC.FileByte.Length);
                pdfStream.Position = 0;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return File(pdfStream, System.Net.Mime.MediaTypeNames.Application.Octet, FileName);
          

        }