DownloadMessageCompleted Event

public event ExtendedAsyncCompletedEventHandler<TResult> DownloadMessageCompleted

Public Event DownloadMessageCompleted ExtendedAsyncCompletedEventHandler(Of TResult)

public:
 event ExtendedAsyncCompletedEventHandler<TResult>^ DownloadMessageCompleted

Shows how to connect to a POP3 server and download a message asynchronously.

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

...

public void DoDownloadMessageAsync()
{
    // Create a new instance of the Pop3 class. 
    Pop3 client = new Pop3();

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

    // Or you can specify the POP3 port with 
    // client.Connect("myserver", 110); 
 
    // Login to the server. 
    client.Authenticate("user", "password");

    // ... 
 
    // Register an event handler. 
    client.DownloadMessageCompleted += client_DownloadMessageCompleted;

    // Download a mail message with sequence number 1 to a file. 
    client.DownloadMessageAsync(1, "c:\\temp\\my message.eml");

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

void client_DownloadMessageCompleted(object sender, ExtendedAsyncCompletedEventArgs<long> e)
{
    // Pop3 client = (Pop3)sender; 
    if (e.Error != null)
        Console.WriteLine("Error: " + e.Error.ToString());
    else 
    {
        // Load the message for reading. 
        MailMessage msg = new MailMessage("c:\\temp\\my message.eml");

        Console.WriteLine("Message downloaded successfully.");
        Console.WriteLine("Message ID: {0}, Subject: {1}", msg.MessageIdentifier, msg.Subject);
    }
}

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

...

Public Sub DoDownloadMessageAsync()
    ' Create a new instance of the Pop3 class. 
    Dim client As New Pop3()

    ' Connect to the server. 
    client.Connect("myserver")

    ' Or you can specify the POP3 port with 
    ' client.Connect("myserver", 110); 
 
    ' Login to the server. 
    client.Authenticate("user", "password")

    ' ... 
 
    ' Register an event handler. 
    AddHandler client.DownloadMessageCompleted, AddressOf client_DownloadMessageCompleted

    ' Download a mail message with sequence number 1 to a file. 
    client.DownloadMessageAsync(1, "c:\temp\my message.eml")

    ' ... 
 
    ' Disconnect. 
    client.Disconnect()
End Sub 
 
Private Sub client_DownloadMessageCompleted(ByVal sender As Object, ByVal e As ExtendedAsyncCompletedEventArgs(Of Long))
    ' Pop3 client = (Pop3)sender; 
    If e.Error IsNot Nothing Then 
        Console.WriteLine("Error: " & e.Error.ToString())
    Else 
        ' Load the message for reading. 
        Dim msg As New MailMessage("c:\temp\my message.eml")

        Console.WriteLine("Message downloaded successfully.")
        Console.WriteLine("Message ID: {0}, Subject: {1}", msg.MessageIdentifier, msg.Subject)
    End If 
End Sub

Reference