pdf download but my pdf is downloaded and opening perfectly but data is not displaying, please tell me possible solution as soon as possible

string constr = ConfigurationManager.ConnectionStrings["DbConnectionString"].ConnectionString;
SqlConnection con = new SqlConnection(constr);
con.Open();
string fileid = Request.QueryString["Id"].ToString();

string query = "select Name,Extension,EncryptedData From EncryptedFile where Id='" + fileid + "'";
SqlCommand com = new SqlCommand(query, con);
com.CommandType = CommandType.Text;
SqlDataReader dr1 = com.ExecuteReader();



while (dr1.Read())
{
    //FileStream fs1 = new FileStream("C:\\Users\\20405\\Desktop\\testpdf.pdf", FileMode.Open, FileAccess.Read);
    //BinaryReader br = new BinaryReader(fs1);
    //Document document = new Document(br);
    string file = dr1["Name"].ToString();
    string odata = Decrypt(dr1["EncryptedData"].ToString());
    string Dext = dr1["Extension"].ToString();
    //byte[] data = System.Text.Encoding.UTF8.GetBytes(odata);
    //byte[] data = Convert.FromBase64String(odata);
    byte[] data = Encoding.UTF8.GetBytes(odata);

    Response.Clear();
    MemoryStream ms = new MemoryStream(data);
    Response.ContentType = "application/pdf";
    Response.AddHeader("content-disposition", "attachment;filename=" + file.ToString());
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.Buffer = true;
    ms.WriteTo(Response.OutputStream);
    Response.Flush();
    Response.End();