[ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use ExecuteCustomCommanAsync instead.")]
public IAsyncResult BeginExecuteCustomCommand(
	string command,
	string commandID,
	AsyncCallback callback,
	Object state
)

<ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use ExecuteCustomCommanAsync instead.")>
Public Function BeginExecuteCustomCommand ( 
	command As String,
	commandID As String,
	callback As AsyncCallback,
	state As Object
) As IAsyncResult

using System;
using MailBee;
using MailBee.ImapMail;
using MailBee.Mime;

class Sample
{
    static void Main(string[] args)
    {
        Console.WriteLine("Input a new folder name to manage");
        string folderName = Console.ReadLine();

        Imap imp = new Imap();

        // Connect to the server and log in the account.
        imp.Connect("imap.domain.com");
        imp.Login("jdoe@domain.com", "secret");

        // Issue NOOP
        imp.BeginExecuteCustomCommand("NOOP", string.Empty, null, null);
        imp.EndExecuteCustomCommand();

        // Create a new folder
        imp.BeginExecuteCustomCommand(
            "CREATE " + ImapUtils.ToUtf7QuotedString(folderName),
            string.Empty, null, null);
        imp.EndExecuteCustomCommand();

        // Select the created folder (to demonstrate asynchronous Expunge).
        imp.BeginSelectFolder(folderName, false, null, null);
        imp.EndSelectFolder();

        // Expunge deleted messages from this folder. This will actually do
        // nothing since the folder is empty but it shows the idea.
        imp.BeginExecuteCustomCommand("EXPUNGE", string.Empty, null, null);
        imp.EndExecuteCustomCommand();

        // Deselect the folder (we could also call BeginClose(true, ...)
        // to close the folder and expunge the deleted messages instead of
        // sending EXPUNGE and calling BeginClose(false, ...).
        imp.BeginClose(false, null, null);
        imp.EndClose();

        // Subscribe the created folder
        imp.BeginExecuteCustomCommand(
            "SUBSCRIBE " + ImapUtils.ToUtf7QuotedString(folderName),
            string.Empty, null, null);
        imp.EndExecuteCustomCommand();

        // Unsubscribe the created folder
        imp.BeginExecuteCustomCommand(
            "UNSUBSCRIBE " + ImapUtils.ToUtf7QuotedString(folderName),
            string.Empty, null, null);
        imp.EndExecuteCustomCommand();

        // Rename the created folder into "MyFolder".
        imp.BeginExecuteCustomCommand(
            "RENAME " + ImapUtils.ToUtf7QuotedString(folderName) + " " +
            ImapUtils.ToQuotedString("MyFolder"), string.Empty, null, null);
        imp.EndExecuteCustomCommand();

        // Delete the created folder
        imp.BeginExecuteCustomCommand(
            "DELETE " + ImapUtils.ToQuotedString("MyFolder"), string.Empty,
            null, null);
        imp.EndExecuteCustomCommand();

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

Imports System
Imports MailBee
Imports MailBee.ImapMail
Imports MailBee.Mime

Module Sample
    Sub Main(ByVal args As String())
        Console.WriteLine("Input a new folder name to manage")
        Dim folderName As String = Console.ReadLine()

        Dim imp As New Imap

        ' Connect to the server and log in the account.
        imp.Connect("imap.domain.com")
        imp.Login("jdoe@domain.com", "secret")

        ' Issue NOOP
        imp.BeginExecuteCustomCommand("NOOP", String.Empty, Nothing, Nothing)
        imp.EndExecuteCustomCommand()

        ' Create a new folder
        imp.BeginExecuteCustomCommand( _
            "CREATE " & ImapUtils.ToUtf7QuotedString(folderName), _
            String.Empty, Nothing, Nothing)
        imp.EndExecuteCustomCommand()

        ' Select the created folder (to demonstrate asynchronous Expunge).
        imp.BeginSelectFolder(folderName, False, Nothing, Nothing)
        imp.EndSelectFolder()

        ' Expunge deleted messages from this folder. This will actually do
        ' nothing since the folder is empty but it shows the idea.
        imp.BeginExecuteCustomCommand("EXPUNGE", String.Empty, Nothing, Nothing)
        imp.EndExecuteCustomCommand()

        ' Deselect the folder (we could also call BeginClose(true, ...)
        ' to close the folder and expunge the deleted messages instead of
        ' sending EXPUNGE and calling BeginClose(false, ...).
        imp.BeginClose(False, Nothing, Nothing)
        imp.EndClose()

        ' Subscribe the created folder
        imp.BeginExecuteCustomCommand( _
            "SUBSCRIBE " & ImapUtils.ToUtf7QuotedString(folderName), _
            String.Empty, Nothing, Nothing)
        imp.EndExecuteCustomCommand()

        ' Unsubscribe the created folder
        imp.BeginExecuteCustomCommand( _
            "UNSUBSCRIBE " & ImapUtils.ToUtf7QuotedString(folderName), _
            String.Empty, Nothing, Nothing)
        imp.EndExecuteCustomCommand()

        ' Rename the created folder into "MyFolder".
        imp.BeginExecuteCustomCommand( _
            "RENAME " & ImapUtils.ToUtf7QuotedString(folderName) & " " & _
            ImapUtils.ToQuotedString("MyFolder"), String.Empty, Nothing, Nothing)
        imp.EndExecuteCustomCommand()

        ' Delete the created folder
        imp.BeginExecuteCustomCommand( _
            "DELETE " & ImapUtils.ToQuotedString("MyFolder"), String.Empty, _
            Nothing, Nothing)
        imp.EndExecuteCustomCommand()

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

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

// Put the code below inside your class.

System.Timers.Timer t = null;
Imap imp = null;

// A callback function. Since it's called on Imap worker thread,
// WinForms timer cannot be used here because it can only be used
// on message loop thread.
private void ExecuteCustomCommandCallback(IAsyncResult result)
{
    Imap imp = (Imap)result.AsyncState;
    imp.EndExecuteCustomCommand();
    imp.Log.WriteLine("NOOP done");
    t.Start();
}

// System.Timers.Timer.Elapsed event handler.
private void OnElapsed(object sender, System.Timers.ElapsedEventArgs e)
{
    t.Stop();

    // Execute NOOP command in Imap worker thread.
    imp.BeginExecuteCustomCommand("NOOP", string.Empty,
        new AsyncCallback(ExecuteCustomCommandCallback), imp);
}

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

    // Enable logging to monitor background activity.
    imp.Log.Filename = @"C:\Temp\log.txt";
    imp.Log.Enabled = true;
    imp.Log.Clear();

    // Connect to the server, login and select inbox.
    imp.Connect("imap.domain.com");
    imp.Login("jdoe", "secret");
    imp.SelectFolder("Inbox");

    // Initialize timer to raise Elapsed event every 10 seconds.
    t = new System.Timers.Timer();
    t.Elapsed += new System.Timers.ElapsedEventHandler(OnElapsed);
    t.Interval = 10000;
    t.Start();
}

// Shutdown Imap component on form closing.
private void Form1_Closing(object sender,
    System.ComponentModel.CancelEventArgs e)
{
    t.Stop();
    if (imp.IsBusy)
    {
        imp.EndExecuteCustomCommand();
    }
    // Disconnect from the server.
    imp.Disconnect();
}

Imports MailBee
Imports MailBee.ImapMail

' Put the code below inside your class.

Dim t As System.Timers.Timer = Nothing
Dim imp As Imap = Nothing

' A callback function. Since it's called on Imap worker thread,
' WinForms timer cannot be used here because it can only be used
' on message loop thread.
Private Sub ExecuteCustomCommandCallback(ByVal result As IAsyncResult)
    Dim imp As Imap = CType(result.AsyncState, Imap)
    imp.EndExecuteCustomCommand()
    imp.Log.WriteLine("NOOP done")
    t.Start()
End Sub

' System.Timers.Timer.Elapsed event handler.
Private Sub OnElapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs)
    t.Stop()

    ' Execute NOOP command in Imap worker thread.
    imp.BeginExecuteCustomCommand("NOOP", String.Empty, _
        New AsyncCallback(AddressOf ExecuteCustomCommandCallback), imp)
End Sub

' The actual code.
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs)
    imp = New Imap

    ' Enable logging to monitor background activity.
    imp.Log.Filename = "C:\Temp\log.txt"
    imp.Log.Enabled = True
    imp.Log.Clear()

    ' Connect to the server, login and select inbox.
    imp.Connect("imap.domain.com")
    imp.Login("jdoe", "secret")
    imp.SelectFolder("Inbox")

    ' Initialize timer to raise Elapsed event every 10 seconds.
    t = New System.Timers.Timer
    AddHandler t.Elapsed, AddressOf OnElapsed
    t.Interval = 10000
    t.Start()
End Sub

' Shutdown Imap component on form closing.
Private Sub Form1_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs)
    t.Stop()
    If imp.IsBusy Then
        imp.EndExecuteCustomCommand()
    End If
    ' Disconnect from the server.
    imp.Disconnect()
End Sub