[ObsoleteAttribute("This method is obsolete in .NET 4.5+.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

<ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use DeleteMessageAsync instead.")>
Public Function BeginDeleteMessage ( 
	index As Integer,
	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.Pop3Mail;

// Put the code below inside your class.

// A callback function.
private void DeleteMessageCallback(IAsyncResult result)
{
    Pop3 pop = (Pop3)result.AsyncState;
    pop.EndDeleteMessage();
    MessageBox.Show("Last message flagged as deleted");
}

// The actual code.
private void Form1_Load(object sender, System.EventArgs e)
{
    Pop3 pop = new Pop3();

    // Let MailBee process events.
    pop.RaiseEventsViaMessageLoop = false;

    pop.Connect("pop.somehost.com");
    pop.Login("jdoe", "secret");

    // Initiate an asynchronous deletion attempt.
    pop.BeginDeleteMessage(pop.InboxMessageCount, _
        new AsyncCallback(DeleteMessageCallback), pop);

    // Simulate some lengthy work here...
    for (int i = 0; i < 100; i++)
    {
        // Make a portion of the work.
        System.Threading.Thread.Sleep(10);

        // Process events which were raised during execution of the work above.
        pop.Wait(0);
    }

    // If flagging the message is still in progress, wait until it's done.
    pop.Wait();

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

' To use the code below, import MailBee namespaces at the top of your code.
Imports MailBee
Imports MailBee.Pop3Mail

' Put the code below inside your class.

' A callback function.
Private Sub DeleteMessageCallback(ByVal result As IAsyncResult)
    Dim pop As New Pop3
    pop = result.AsyncState
    pop.EndDeleteMessage()
    MsgBox("Last message flagged as deleted")
End Sub

' The actual code.
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim pop As New Pop3

    ' Let MailBee process events.
    pop.RaiseEventsViaMessageLoop = False

    pop.Connect("pop.somehost.com")
    pop.Login("jdoe", "secret")

    ' Initiate an asynchronous deletion attempt.
    pop.BeginDeleteMessage(pop.InboxMessageCount, _
        New AsyncCallback(AddressOf DeleteMessageCallback), pop)

    ' Simulate some lengthy work here...
    Dim i As Integer
    For i = 1 To 100
        ' Make a portion of the work.
        System.Threading.Thread.Sleep(10)

        ' Process events which were raised during execution of the work above.
        pop.Wait(0)
    Next

    ' If flagging the message is still in progress, wait until it's done.
    pop.Wait()

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