SendEmail Custom Activity

SendEmailActivity.cs

using System;
using System.Activities;
using System.ComponentModel;
 
namespace MyActivityLibrary {
    public sealed class SendEmailActivity : CodeActivity {
        public InArgument<string> to { get; set; }
        public InArgument<string> subject { get; set; }
        public InArgument<string> body { get; set; }
        private string from = "*****@****.com";
        private string host = "smtp.*****.com";
        private string userName = "******";
        private string password = "*****";
        public OutArgument<string> result { get; set; }
 
        protected override void Execute(CodeActivityContext context) {
            var mailMessage = new System.Net.Mail.MailMessage();
            mailMessage.To.Add(to.Get(context).ToString());
            mailMessage.Subject = subject.Get(context).ToString();
            mailMessage.Body = body.Get(context);
            mailMessage.From = new System.Net.Mail.MailAddress(from);
            var smtp = new System.Net.Mail.SmtpClient();
            smtp.Host = host;
            smtp.Credentials = new System.Net.NetworkCredential(userName, password);
            smtp.EnableSsl = true;
            smtp.Send(mailMessage);
            result.Set(context, "ok");
        }
    }
}