public bool Add(
	Stream stream,
	string targetFilename,
	string contentID,
	string contentType,
	HeaderCollection customHeaders,
	NewAttachmentOptions options,
	MailTransferEncoding mailEnc
)

Public Function Add ( 
	stream As Stream,
	targetFilename As String,
	contentID As String,
	contentType As String,
	customHeaders As HeaderCollection,
	options As NewAttachmentOptions,
	mailEnc As MailTransferEncoding
) As Boolean

// To use the code below, import these namespaces at the top of your code.
using System.IO;
using MailBee;
using MailBee.Mime;

// The actual code (put it into a method of your class)

// Open the file as stream for reading.
using (FileStream fs = new FileStream(@"C:\Docs\1.gif", FileMode.Open))
{
    // Create new MailMessage object.
    MailMessage msg = new MailMessage();

    // Set plain text body of the message.
    msg.BodyPlainText = "Hello, World!";

    // Add the attachment to the message.
    msg.Attachments.Add(fs, "pic1.gif", "<12s4a8a8778c$5664i1b1$ir671781@tlffmdqjobxj>", "image/gif", null, NewAttachmentOptions.None, MailTransferEncoding.Base64);

    // Save message to disk.
    msg.SaveMessage(@"C:\Temp\SavedMessage.eml");
}

' To use the code below, import these namespaces at the top of your code.
Imports System.IO
Imports MailBee
Imports MailBee.Mime

' The actual code (put it into a method of your class)

' Open the file as stream for reading.
Dim fs As FileStream
fs = Nothing
Try
    fs = New FileStream("C:\Docs\1.gif", FileMode.Open)

    ' Create new MailMessage object.
    Dim msg As New MailMessage

    ' Set plain text body of the message.
    msg.BodyPlainText = "Hello, World!"

    ' Add the attachment to the message.
    msg.Attachments.Add(fs, "pic1.gif", "<12s4a8a8778c$5664i1b1$ir671781@tlffmdqjobxj>", "image/gif", Nothing, NewAttachmentOptions.None, MailTransferEncoding.None)

    ' Save message to disk.
    msg.SaveMessage("C:\Temp\SavedMessage.eml")
Finally
    If Not fs Is Nothing Then fs.Close()
End Try