[ObsoleteAttribute("This method is obsolete in .NET 4.5+.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ObsoleteAttribute("This method is obsolete in .NET 4.5+.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.ImapMail;

class Sample
{
    // A callback function.
    private static void LoginCallback(IAsyncResult result)
    {
        Imap imp = (Imap)result.AsyncState;
        imp.EndLogin();
        imp.SelectFolder("INBOX");
        Console.WriteLine("Message #" + imp.Unseen + " is first unseen");
    }

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

        imp.Connect("imap.somehost.com");

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

        // 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 (imp.IsBusy) ar.AsyncWaitHandle.WaitOne();

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

Imports System
Imports MailBee
Imports MailBee.ImapMail

Class Sample
    ' A callback function.
    Private Shared Sub LoginCallback(ByVal result As IAsyncResult)
        Dim imp As New Imap
        imp = result.AsyncState
        imp.EndLogin()
        imp.SelectFolder("INBOX")
        Console.WriteLine("Message #" & imp.Unseen & " is first unseen")
    End Sub

    ' The actual code.
    Shared Sub Main(ByVal args As String())
        Dim imp As New Imap

        imp.Connect("imap.somehost.com")

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

        ' 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 imp.IsBusy
            ar.AsyncWaitHandle.WaitOne()
        End While

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