C# code example where an email is sent to multiple recipients where the email address of the recipients comes from a stored proc

I have an applicaion where the  an email is sent out to multiple recipients of a course when somthing about that course  has changed. I have a stored proc that gets the email address based off of the course id. I then send the email out reflecting the changes made to the course in an html formatted email.  The issue that I am running into is trying to get the email to go out to the multiple recipients  instead of the  last attended's email address found from the stored proc.
My code is listed below:

//Send email of course cancellation
                        StoredProcConnect sprocRoster = new StoredProcConnect("sp_GetRosterByCourseID");
                        sprocRoster.AddParameters("COURSEID");
                        sprocRoster.AddValues(id);
                        DataSet ds = sprocRoster.Select();
                        if (ds == null)
                            Response.Redirect("ErrorMsg.aspx?error=Problem Getting Roster Info.  Tech team has been notified, please try again");

                                MailAddressCollection coll = new MailAddressCollection();                     
   if (ds.Tables[0].Rows.Count > 0)
                        {
                               string To = string.Empty;
                            foreach (DataRow row in ds.Tables[0].Rows)
                            {
                                msg.To.Add(row["email"].ToString() + "@COMPANY.com");
                                To = (row["email"].ToString() + "@COMPANY.com");
                            }

                            //toAddress = new Array(To);

                            coll.Add(To);

                            msg.From = new MailAddress("ClassChange@allstate.com");
                            msg.Subject = "An update to " + courseName + " has been made!";

                            // SendEmail();
                            if (chkCourseName.Checked == true)
                            {
                              var Body = this.PopulateBody(courseName,
                              courseName + "  Has been changed!",
                              "A new entry will be sent to your Outlook Calendar."
                              + "Please remove the old entry and accept the new entry." + name, "Sorry for any inconvenience that this change may have occured. " + "<br/>" + lblPresenter + "<br/>");
                              this.SendHtmlFormattedEmail(To, "An update to " + courseName + " has been made!", Body);
                            }
                         }

private string PopulateBody(string courseName, string title, string url, string description)
        {
            string body = string.Empty;
            using (StreamReader reader = new StreamReader(Server.MapPath("~/HtmlPage1.html")))
            {
                body = reader.ReadToEnd();
            }
            body = body.Replace("{UserName}", courseName);
            body = body.Replace("{Title}", title);
            body = body.Replace("{Url}", url);
            body = body.Replace("{Description}", description);
            return body;
        }

        private void SendHtmlFormattedEmail(string recepientEmail, string subject, string Body)
        {
            using (MailMessage mailMessage = new MailMessage())
            {
                mailMessage.From = new MailAddress("Responses@COMPANY.com");
                mailMessage.Subject = subject;
                mailMessage.Body = Body;
                mailMessage.IsBodyHtml = true;
                mailMessage.To.Add(new MailAddress(recepientEmail));
                Smtp info goes here
            }
        }

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