SYSTEM NETMAIL

The following code was being utilized with a form for which after submittal it would send out an e-mail.   I recently changed host services and now it appears that I need to incorperate the host server credentials ie "Name and Password" to function.   Referencing the code below I am gettting a line error @ (SmtpClient.Credentials) stating an object reference is required or property 'System.NetMail.Smtp.Client.Credentials.get'


        AlternateView htmlView = AlternateView.CreateAlternateViewFromString(htmlBody, null, "text/html");
        message.AlternateViews.Add(plainView);
        message.AlternateViews.Add(htmlView);
        message.Priority = MailPriority.High;
        smtpClient.Host = "server.net ";
        SmtpClient.Credentials = new NetworkCredential("support@namannassar.com", "passcode");
        smtpClient.Send(message);