[ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use DownloadEntireMessagesAsync or DownloadMessageHeadersAsync instead.")]
public IAsyncResult BeginDownloadMessages(
	int startIndex,
	int count,
	int bodyLineCount,
	AsyncCallback callback,
	Object state
)

<ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use DownloadEntireMessagesAsync or DownloadMessageHeadersAsync instead.")>
Public Function BeginDownloadMessages ( 
	startIndex As Integer,
	count As Integer,
	bodyLineCount As Integer,
	callback As AsyncCallback,
	state As Object
) As IAsyncResult

using System;
using MailBee;
using MailBee.Pop3Mail;
using MailBee.Mime;

class Sample
{
    // MessageDataChunkReceived event handler.
    private static void OnMessageDataChunkReceived(object sender,
        Pop3MessageDataChunkReceivedEventArgs e)
    {
        Console.WriteLine(e.BytesJustReceived + " bytes of the message #" +
            e.MessageNumber + " received");
    }

    // The actual code.
    static void Main(string[] args)
    {
        Pop3 pop = new Pop3();
        pop.Connect("pop.somehost.com");
        pop.Login("jdoe", "secret");

        // Subscribe to MessageDataChunkReceived event.
        pop.MessageDataChunkReceived +=
            new Pop3MessageDataChunkReceivedEventHandler(OnMessageDataChunkReceived);

        // Initiate an asynchronous download attempt.
        pop.BeginDownloadMessages(1, -1, 0, null, null);

        // Simulate some lengthy work here. At the same time,
        // the messages are downloaded on another thread.
        System.Threading.Thread.Sleep(3000);

        // End the messages download operation and return MailMessageCollection object.
        // If the operation is still in progress at the moment when 
        // this method starts, the method will wait until the operation completion.
        MailMessageCollection msgs = pop.EndDownloadMessages();

        foreach (MailMessage msg in msgs)
        {
            Console.WriteLine("Message #" + msg.IndexOnServer +
                ": the length of the entire message is " + msg.SizeOnServer +
                " bytes, the length of the downloaded header is " + msg.Size + " bytes.");
        }

        // Disconnect from the server.
        pop.Disconnect();
    }
}

Imports System
Imports MailBee
Imports MailBee.Pop3Mail
Imports MailBee.Mime

Class Sample
    ' MessageDataChunkReceived event handler.
    Private Shared Sub OnMessageDataChunkReceived(ByVal sender As Object, _
        ByVal e As Pop3MessageDataChunkReceivedEventArgs)
        Console.WriteLine(e.BytesJustReceived & " bytes of the message #" & _
            e.MessageNumber & " received")
    End Sub

    ' The actual code
    Shared Sub Main(ByVal args As String())
        Dim pop As Pop3
        pop.Connect("pop.somehost.com")
        pop.Login("jdoe", "secret")

        ' Subscribe to MessageDataChunkReceived event.
        AddHandler pop.MessageDataChunkReceived, AddressOf OnMessageDataChunkReceived

        ' Initiate an asynchronous download attempt.
        pop.BeginDownloadMessages(1, -1, 0, Nothing, Nothing)

        ' Simulate some lengthy work here. At the same time,
        ' the messages are downloaded on another thread.
        System.Threading.Thread.Sleep(3000)

        ' End the messages download operation and return MailMessageCollection object.
        ' If the operation is still in progress at the moment when 
        ' this method starts, the method will wait until the operation completion.
        Dim msgs As MailMessageCollection
        msgs = pop.EndDownloadMessages()

        For Each msg As MailMessage In msgs
            Console.WriteLine("Message #" + msg.IndexOnServer & _
                ": the length of the entire message is " & msg.SizeOnServer & _
                " bytes, the length of the downloaded header is " & msg.Size & " bytes.")
        Next

        ' Disconnect from the server.
        pop.Disconnect()
    End Sub
End Class