[ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use LoginAsync instead.")]
public IAsyncResult BeginLogin(
	string targetName,
	string domain,
	string accountName,
	string password,
	AuthenticationMethods authMethods,
	AuthenticationOptions authOptions,
	SaslMethod authUserDefined,
	AsyncCallback callback,
	Object state
)

<ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use LoginAsync instead.")>
Public Function BeginLogin ( 
	targetName As String,
	domain As String,
	accountName As String,
	password As String,
	authMethods As AuthenticationMethods,
	authOptions As AuthenticationOptions,
	authUserDefined As SaslMethod,
	callback As AsyncCallback,
	state As Object
) As IAsyncResult

using System;
using MailBee;
using MailBee.Pop3Mail;

class Sample
{
    // A callback function.
    private static void LoginCallback(IAsyncResult result)
    {
        Pop3 pop = (Pop3)result.AsyncState;
        pop.EndLogin();
        Console.WriteLine("Overall size of all messages in the inbox is " +
            pop.InboxSize + " bytes");
    }

    // The actual code.
    static void Main(string[] args)
    {
        Pop3 pop = new Pop3();

        pop.Connect("pop.somehost.com");

        // Initiate an asynchronous login attempt.
        IAsyncResult ar = pop.BeginLogin(null, null, "jdoe", "secret",
            AuthenticationMethods.Auto, AuthenticationOptions.None,
            null, new AsyncCallback(LoginCallback), pop);

        // Simulate some lengthy work here. At the same time,
        // login is executed on another thread.
        System.Threading.Thread.Sleep(3000);

        // If the login attempt is still in progress, then wait until it's finished.
        while (pop.IsBusy) ar.AsyncWaitHandle.WaitOne();

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

Imports System
Imports MailBee
Imports MailBee.Pop3Mail

Class Sample
    ' A callback function.
    Private Shared Sub LoginCallback(ByVal result As IAsyncResult)
        Dim pop As New Pop3
        pop = result.AsyncState
        pop.EndLogin()
        Console.WriteLine("Overall size of all messages in the inbox is " & _
            pop.InboxSize & " bytes")
    End Sub

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

        ' Initiate an asynchronous login attempt.
        Dim ar = pop.BeginLogin(Nothing, Nothing, "jdoe", "secret", _
            AuthenticationMethods.Auto, AuthenticationOptions.None, _
            Nothing, New AsyncCallback(AddressOf LoginCallback), pop)

        ' Simulate some lengthy work here. At the same time 
        ' login is executed on another thread.
        System.Threading.Thread.Sleep(3000)

        ' If the login attempt is still in progress, then wait until it's finished.
        While pop.IsBusy
            ar.AsyncWaitHandle.WaitOne()
        End While

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