[ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use LoginAsync instead.")]
public IAsyncResult BeginLogin(
	AsyncCallback callback,
	Object state
)

<ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use LoginAsync instead.")>
Public Function BeginLogin ( 
	callback As AsyncCallback,
	state As Object
) As IAsyncResult

// To use the code below, import MailBee namespaces at the top of your code.
using MailBee;
using MailBee.SmtpMail;

// Put the code below inside your class.

// Login callback function.
private void LoginCallback(IAsyncResult result)
{
    Smtp mailer = (Smtp)result.AsyncState;

    mailer.EndLogin();
    MessageBox.Show("Authentication succeeded");

    // Close the connection.
    mailer.Disconnect();
}

// The actual code.
private void Form1_Load(object sender, System.EventArgs e)
{
    Smtp mailer = new Smtp();

    mailer.SmtpServers.Add("smtp.somehost.com", "jdoe", "secret");

    // Connect to SMTP server and say Hello.
    mailer.Connect();
    mailer.Hello();

    // Initiate an asynchronous authentication attempt.
    mailer.BeginLogin(new AsyncCallback(LoginCallback), mailer);
}

' To use the code below, import MailBee namespaces at the top of your code.
Imports MailBee
Imports MailBee.SmtpMail

' Put the code below inside your class.

' Login callback function.
Private Sub LoginCallback(ByVal result As IAsyncResult)
    Dim mailer As Smtp = result.AsyncState

    mailer.EndLogin()
    MsgBox("Authentication succeeded")

    ' Close the connection.
    mailer.Disconnect()
End Sub

' The actual code.
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim mailer As New Smtp

    mailer.SmtpServers.Add("smtp.somehost.com", "jdoe", "secret")

    ' Connect to SMTP server and say Hello.
    mailer.Connect()
    mailer.Hello()

    ' Initiate an asynchronous authentication attempt.
    mailer.BeginLogin(New AsyncCallback(AddressOf LoginCallback), mailer)
End Sub