An invalid character was found in the mail header: ';'.
String s="arun@gamil.com,mohan@gmail.com";
MailMessage oMailMessage = new MailMessage();
oMailMessage.To.Add(new MailAddress(s));
oMailMessage.From = new MailAddress(oSmtpSection.From);
I am getting error in oMailMessage.To.Add(new MailAddress(s));