public byte[] GetData(
	int offset,
	int size
)

Public Function GetData ( 
	offset As Integer,
	size As Integer
) As Byte()

// 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)

// Load the message from file.
MailMessage msg = new MailMessage();
msg.LoadMessage(@"C:\Docs\TestMail.eml");

// When there is any attachment...
if (msg.Attachments.Count > 0)
{
    // ...open a file for writing...
    using (BinaryWriter bw = new BinaryWriter(File.OpenWrite(@"C:\Temp\" + msg.Attachments[0].Filename)))
    {
        // ...and write the attachment content to the file.
        bw.Write(msg.Attachments[0].GetData(0, -1));
    }
}

' 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)

' Load the message from file.
Dim msg As New MailMessage
msg.LoadMessage("C:\Docs\TestMail.eml")

' When there is any attachment...
If msg.Attachments.Count > 0 Then
    ' ...open a file for writing...
    Dim bw As BinaryWriter
    Try
        bw = New BinaryWriter(System.IO.File.OpenWrite("C:\Temp\" & msg.Attachments(0).Filename))

        ' ...and write the attachment content to the file.
        bw.Write(msg.Attachments(0).GetData(0, -1))
    Finally
        If Not bw Is Nothing Then
            bw.Close()
        End If    
    End Try
End If