System.Net.Mail.Attachment.CreateAttachmentFromString

OK, This function is killing me, I have everthing setup correclty, I am passing string and attaching the file to an email. The file attaches and is there correctly.

BUT the body of the email also contains the plain test of the string. I have tried every possible solution that I know to get rid of the body that is is automatically putting in there. If i do message.body = "" it is still there. If I do message.body = "this is my body" it puts it above all the html.

I am at a loss, any help is appreciated.

System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage(ConfigurationSettings.AppSettings["Administrator"].ToString(), MailID, "Lab Report", "Lab Report is attached");

 htmlTableContent += "<table><TR>";

                    foreach (DataColumn dCol1 in ds.Tables[0].Columns)
                    {
                        htmlTableContent += "<TD CLASS=printReciept>&nbsp;<B>" + dCol1.ColumnName.ToString() + "</B></TD>";
                    }

                    htmlTableContent += "</TR>";

                    foreach (DataRow dr in ds.Tables[0].Rows)
                    {
                        htmlTableContent += "<TR CLASS= printReciept>";

                        foreach (DataColumn dCol in ds.Tables[0].Columns)
                        {
                            string strToPrint;

                            if (dr[dCol.Ordinal].ToString().Trim() == "")
                            {
                                strToPrint = ".";
                            }
                            else
                            {
                                strToPrint = dr[dCol.Ordinal].ToString().Trim();
                            }
                            if (strToPrint.ToUpper() == "TRUE")
                            {
                                strToPrint = "Yes";
                            }
                            else if (strToPrint.ToUpper() == "FALSE")
                            {
                                strToPrint = "No";
                            }

                            htmlTableContent += "<TD>&nbsp;" + strToPrint + "</TD>";
                        }

                        htmlTableContent += "</TR>";
                    }
                    htmlTableContent += "</table>";

                    message.IsBodyHtml = false;
                    
                    var attachment = System.Net.Mail.Attachment.CreateAttachmentFromString(htmlTableContent.ToString(), "application/vnd.xls");
                   
                    message.Attachments.Add(attachment);                   
                    SmtpClient smtp = new SmtpClient();

                    smtp.Host = ConfigurationSettings.AppSettings["SMTPServerName"].ToString();
                    smtp.Port = 25;
                    smtp.Credentials = new System.Net.NetworkCredential(ConfigurationSettings.AppSettings["Administrator"].ToString(), ConfigurationSettings.AppSettings["Mailpwd"].ToString());
                    message.Body = "";
                    smtp.Send(message);

Mithun P