C# code send attachment(.csv file) in email where the attachement is done as an in-memory operation

public static void SendEmailWithAttachment(StringBuilder sb, Tuple<string, int, string, string> smptTuple, Tuple<string, string, string, string, string, string> emailInfoTuple)
        {
            try
            {
                string smptHost = smptTuple.Item1;
                int smptPort = smptTuple.Item2;
                string smptUser = smptTuple.Item3;
                string smptPassword = smptTuple.Item4;
                string fromEmailAddress = emailInfoTuple.Item1;
                string toEmailAddress = emailInfoTuple.Item2;
                string ccEmailAddress = emailInfoTuple.Item3;
                string subject = emailInfoTuple.Item4;
                string body = emailInfoTuple.Item5;
                string attachmentName = emailInfoTuple.Item6;

                using (MemoryStream stream = new MemoryStream(Encoding.ASCII.GetBytes(sb.ToString())))
                {
                    MailMessage mailMsg = new MailMessage();
                    MailAddress emailAddress = new MailAddress(toEmailAddress);
                    mailMsg.To.Add(emailAddress);

                    foreach (var address in ccEmailAddress.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries))
                    {
                        mailMsg.CC.Add(address);
                    }

                    mailMsg.From = new MailAddress(fromEmailAddress);

                    //Add a new attachment to the E-mail message, using the correct MIME type
                    Attachment attachment = new Attachment(stream, new ContentType("text/csv"));
                    attachment.Name = attachmentName;
                    mailMsg.Attachments.Add(attachment);

                    mailMsg.Subject = subject;
                    mailMsg.Body = body;
                    mailMsg.IsBodyHtml = true;

                    // Init SmtpClient
                    SmtpClient smtpClient = new SmtpClient(smptHost, smptPort);
                    smtpClient.EnableSsl = false;
                    System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(smptUser, smptPassword);
                    smtpClient.Credentials = credentials;

                    //send email
                    smtpClient.Send(mailMsg);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }