// create an instance of the MailMessage class
var message = new MailMessage();
// set from, to, subject and body properties
message.From = "sender@domain.com";
message.To = "receiver@domain.com";
message.Subject = "This is test message";
mamessageilMsg.Body = "This is test body";
// create an instance of the MapiMessage class and pass object of MailMessage as argument
var msg = MapiMessage.FromMailMessage(message);
// save file on disc
msg.Save(dir + "output.msg");

// create SmtpClient as client and specify server, port, user name and password
SmtpClient client = new SmtpClient("mail.server.com", 25, "Username", "Password");

// create instances of MailMessage class and Specify To, From, Subject and Message
MailMessage message1 = new MailMessage("msg1@from.com", "msg1@to.com", "Subject1", "message1, how are you?");
MailMessage message2 = new MailMessage("msg1@from.com", "msg2@to.com", "Subject2", "message2, how are you?");
MailMessage message3 = new MailMessage("msg1@from.com", "msg3@to.com", "Subject3", "message3, how are you?");

// create an instance of MailMessageCollection class
MailMessageCollection manyMsg = new MailMessageCollection();
manyMsg.Add(message1);
manyMsg.Add(message2);
manyMsg.Add(message3);

// send emails in bulk
client.Send(manyMsg);

// create and initialize an instance of the Appointment class
var appointment = new Appointment(
	"Meeting Room 3 at Office Headquarters",// Location
	"Monthly Meeting",                      // Summary
	"Please confirm your availability.",    // Description
	new DateTime(2015, 2, 8, 13, 0, 0),     // Start date
	new DateTime(2015, 2, 8, 14, 0, 0),     // End date
	"from@domain.com",                      // Organizer
	"attendees@domain.com");                // Attendees

// save the appointment to disk in ICS format
appointment.Save("output.ics", AppointmentSaveFormat.Ics);