Sending mail with attachments

MIME attachments are represented by Attachment objects, and are managed by use of the MailMessage.Attachments property. The source of attachments can be a file, a MemoryStream, or any other type of .NET Framework Stream. As a result, the ways an attachment can be created is limitless. This topic demonstrates two ways of creating an attachment.

using System;
using System.IO;
using System.Windows.Forms;
using ComponentPro.Net;
using ComponentPro.Net.Mail;

...

const string serverName = "myserver";
const string user = "name@domain.com";
const string password = "mytestpassword";
const int port = 465;
const SslSecurityMode securityMode = SslSecurityMode.Implicit;

Smtp client = new Smtp();
try
{
    MailMessage mmMessage = new MailMessage();
    mmMessage.From.Add("from@thedomain.com");
    mmMessage.To.Add("name@domain.com");
    mmMessage.Subject = "Test Subject";
    mmMessage.BodyText = "Test Content";
    // Attach file to the message. 
    mmMessage.Attachments.Add("myfile.dat");

    // Attach content data from a stream to the message. 
    Stream stream = new FileStream("myfile.dat", FileMode.Open);
    // The stream will be automatically closed after adding to the attachment list. 
    mmMessage.Attachments.Add(new Attachment(stream, "teststream"));

    Console.WriteLine("Connecting SMTP server: {0}:{1}...", serverName, port);
    // Connect to the server. 
    client.Connect(serverName, port, securityMode);

    // Login to the server. 
    Console.WriteLine("Logging in as {0}...", user);
    client.Authenticate(user, password);

    Console.WriteLine("Sending the message with attachment...");
    client.Send(mmMessage);
    Console.WriteLine("Message sent...");

    // Disconnect. 
    Console.WriteLine("Disconnecting...");
    client.Disconnect();
}
catch (SmtpException smtpExc)
{
    MessageBox.Show(string.Format("An SMTP error occurred: {0}, ErrorStatus: {1}", smtpExc.Message, smtpExc.Status));
}
catch (Exception exc)
{
    MessageBox.Show(string.Format("An error occurred: {0}", exc.Message));
}

Imports System.IO
Imports ComponentPro.Net
Imports ComponentPro.Net.Mail

...

Const serverName As String = "myserver" 
Const user As String = "name@domain.com" 
Const password As String = "mytestpassword" 
Const port As Integer = 465
Const securityMode As SslSecurityMode = SslSecurityMode.Implicit

Dim client As New Smtp()
Try 
    Dim mmMessage As New MailMessage()
    mmMessage.From.Add("from@thedomain.com")
    mmMessage.To.Add("name@domain.com")
    mmMessage.Subject = "Test Subject" 
    mmMessage.BodyText = "Test Content" 
    ' Attach file to the message. 
    mmMessage.Attachments.Add("myfile.dat")

    ' Attach content data from a stream to the message. 
    Dim stream As Stream = New FileStream("myfile.dat", FileMode.Open)
    ' The stream will be automatically closed after adding to the attachment list. 
    mmMessage.Attachments.Add(New Attachment(stream, "teststream"))

    Console.WriteLine("Connecting SMTP server: {0}:{1}...", serverName, port)
    ' Connect to the server. 
    client.Connect(serverName, port, securityMode)

    ' Login to the server. 
    Console.WriteLine("Logging in as {0}...", user)
    client.Authenticate(user, password)

    Console.WriteLine("Sending the message with attachment...")
    client.Send(mmMessage)
    Console.WriteLine("Message sent...")

    ' Disconnect. 
    Console.WriteLine("Disconnecting...")
    client.Disconnect()
Catch smtpExc As SmtpException
    MessageBox.Show(String.Format("An SMTP error occurred: {0}, ErrorStatus: {1}", smtpExc.Message, smtpExc.Status))
Catch exc As Exception
    MessageBox.Show(String.Format("An error occurred: {0}", exc.Message))
End Try