AuthenticateCompleted Event

public event AsyncCompletedEventHandler AuthenticateCompleted

Public Event AuthenticateCompleted AsyncCompletedEventHandler

public:
 event AsyncCompletedEventHandler^ AuthenticateCompleted

Asynchronously connect to an IMAP server and list existing mailboxes (Task-based asynchronous approach).

using System;
using System.ComponentModel;
using System.Text;
using ComponentPro.Net.Mail;
using ComponentPro;

...

// Create a new instance.
Imap client = new Imap();

try
{
    // Connect to the IMAP server asynchronously. 
    await client.ConnectAsync("myserver");

    // Or you can specify the IMAP port with 
    // await client.ConnectAsync("myserver", 143); 
 
    // Authenticate the user asynchronously. 
    await client.AuthenticateAsync("userName", "password");

    // Do something here... 
    StringBuilder sb = new StringBuilder();

    FolderCollection list = client.ListFolders();
    for (int i = 0; i < list.Count; i++)
    {
        sb.AppendFormat("{0} - {1}\r\n", i + 1, list[i].Name);
    }

    Console.WriteLine(sb.ToString());

    // ... 
 
    // Disconnect asynchronously. 
    await client.DisconnectAsync();
}
catch (Exception ex)
{
    Console.WriteLine("Error: " + ex.ToString());
}

Imports System.ComponentModel
Imports System.Text
Imports ComponentPro.Net.Mail
Imports ComponentPro

...

' Create a new instance. 
Dim client As New Imap()

Try 
    ' Connect to the IMAP server asynchronously. 
    Await client.ConnectAsync("myserver")

    ' Or you can specify the IMAP port with 
    ' Await client.ConnectAsync("myserver", 143); 
 
    ' Authenticate the user asynchronously. 
    Await client.AuthenticateAsync("userName", "password")

    ' Do something here... 
    Dim sb As New StringBuilder()

    Dim list As FolderCollection = client.ListFolders()
    For i As Integer = 0 To list.Count - 1
        sb.AppendFormat("{0} - {1}" & vbCrLf, i + 1, list(i).Name)
    Next i

    Console.WriteLine(sb.ToString())

    ' ... 
 
    ' Disconnect asynchronously. 
    Await client.DisconnectAsync()
Catch ex As Exception
    Console.WriteLine("Error: " & ex.ToString())
End Try

Asynchronously connect to an IMAP server and list existing mailboxes (Event-based asynchronous approach).

using System;
using System.ComponentModel;
using System.Text;
using ComponentPro.Net.Mail;
using ComponentPro;

...

public void DoAsyncConnect()
{
    // Create a new instance. 
    Imap client = new Imap();

    client.ConnectCompleted += client_ConnectCompleted;
    client.AuthenticateCompleted += client_AuthenticateCompleted;
    client.DisconnectCompleted += client_DisconnectCompleted;

    // Connect to the IMAP server asynchronously. 
    client.ConnectAsync("myserver");

    // Or you can specify the IMAP port with 
    // client.ConnectAsync("myserver", 143); 
 
    // Your code here 
    // ...
}

void client_ConnectCompleted(object sender, ExtendedAsyncCompletedEventArgs<string> e)
{
    Imap client = (Imap)sender;
    if (e.Error != null)
    {
        Console.WriteLine("Error: " + e.Error.ToString());
        return;
    }

    // Authenticate the user asynchronously. 
    client.AuthenticateAsync("userName", "password");
}

void client_AuthenticateCompleted(object sender, AsyncCompletedEventArgs e)
{
    Imap client = (Imap)sender;
    if (e.Error != null)
    {
        Console.WriteLine("Error: " + e.Error.ToString());
        return;
    }

    // Do something here... 
    StringBuilder sb = new StringBuilder();

    FolderCollection list = client.ListFolders();
    for (int i = 0; i < list.Count; i++)
    {
        sb.AppendFormat("{0} - {1}\r\n", i + 1, list[i].Name);
    }

    Console.WriteLine(sb.ToString());

    // ... 
 
    // Disconnect asynchronously. 
    client.DisconnectAsync();
}

void client_DisconnectCompleted(object sender, ExtendedAsyncCompletedEventArgs<string> e)
{
    Imap client = (Imap)sender;
    if (e.Error != null)
    {
        Console.WriteLine("Error: " + e.Error.ToString());
    }
}

Imports System.ComponentModel
Imports System.Text
Imports ComponentPro.Net.Mail
Imports ComponentPro

...

Public Sub DoAsyncConnect()
    ' Create a new instance. 
    Dim client As New Imap()

    AddHandler client.ConnectCompleted, AddressOf client_ConnectCompleted
    AddHandler client.AuthenticateCompleted, AddressOf client_AuthenticateCompleted
    AddHandler client.DisconnectCompleted, AddressOf client_DisconnectCompleted

    ' Connect to the IMAP server asynchronously. 
    client.ConnectAsync("myserver")

    ' Or you can specify the IMAP port with 
    ' client.ConnectAsync("myserver", 143); 
 
    ' Your code here 
    ' ... 
End Sub 
 
Private Sub client_ConnectCompleted(ByVal sender As Object, ByVal e As ExtendedAsyncCompletedEventArgs(Of String))
    Dim client As Imap = CType(sender, Imap)
    If e.Error IsNot Nothing Then 
        Console.WriteLine("Error: " & e.Error.ToString())
        Return 
    End If 
 
    ' Authenticate the user asynchronously. 
    client.AuthenticateAsync("userName", "password")
End Sub 
 
Private Sub client_AuthenticateCompleted(ByVal sender As Object, ByVal e As AsyncCompletedEventArgs)
    Dim client As Imap = CType(sender, Imap)
    If e.Error IsNot Nothing Then 
        Console.WriteLine("Error: " & e.Error.ToString())
        Return 
    End If 
 
    ' Do something here... 
    Dim sb As New StringBuilder()

    Dim list As FolderCollection = client.ListFolders()
    For i As Integer = 0 To list.Count - 1
        sb.AppendFormat("{0} - {1}" & vbCrLf, i + 1, list(i).Name)
    Next i

    Console.WriteLine(sb.ToString())

    ' ... 
 
    ' Disconnect asynchronously. 
    client.DisconnectAsync()
End Sub 
 
Private Sub client_DisconnectCompleted(ByVal sender As Object, ByVal e As ExtendedAsyncCompletedEventArgs(Of String))
    Dim client As Imap = CType(sender, Imap)
    If e.Error IsNot Nothing Then 
        Console.WriteLine("Error: " & e.Error.ToString())
    End If 
End Sub

Reference