using System.Net.Mail;
using System.Configuration;

public int SendMessage(string subject, string messageBody,string fromAddress, string toAddress)
{
    MailMessage message = new MailMessage();
    message.IsBodyHtml = true;
    SmtpClient client = new SmtpClient();
    message.From = new MailAddress(fromAddress.ToString ());
    if (toAddress.Trim().Length > 0)
    {
         foreach (string addr in toAddress.Split(';'))//you can use any delimiter
         {
             message.To.Add(new MailAddress(addr));
         }
     }
     message.Subject = subject;
     message.Body = messageBody;
     client.Host = "SMTPServerName";
     client.Send(message);
     return 1;
}