Web Forms :: Reading Body Of Email - Multipart Message In MIME Format

In my application, while reading body of mail. I am getting the text of the body as "This is a multipart message in MIME format."

Here is my code
SmtPop.POP3Client pop = new SmtPop.POP3Client();
pop.Open(serverName, 110, emailId, passWord);
SmtPop.POPMessageId[] messages = pop.GetMailList();
if (messages == null) return;
foreach (SmtPop.POPMessageId id in messages) {
try { Byte[] b = new Byte[0];
SmtPop.POPReader reader = pop.GetMailReader(id);
SmtPop.MimeMessage msg = new SmtPop.MimeMessage();
msg.Read(reader); Boolean kasbook=false;
String caseCode =null; string body = msg.Body; // read message
Regex rx = new Regex(@"(d{6}?)",RegexOptions.IgnoreCase);
MatchCollection matches = rx.Matches(msg.Subject);
if(matches.Count > 0) caseCode=matches[0].Value;
kasbook = Regex.IsMatch(msg.Subject,@"(kas)",RegexOptions.IgnoreCase);
if (msg.Attachments == null) continue;

Why I am not able to read the body of the mail.