Cannot get IIS pickup directory

hi,
Got error as Cannot get IIS pickup directory
Used Namespace
using System.Net; using System.Net.Mail;

Code behind
            MailMessage objMailMsg = new MailMessage(From, To);             objMailMsg.BodyEncoding = Encoding.UTF8;             objMailMsg.Subject = Subject;             objMailMsg.Body = message;             objMailMsg.IsBodyHtml = true;             SmtpClient objSMTPClient = new SmtpClient();              &nb ...