UndeleteCompleted Event

public event AsyncCompletedEventHandler UndeleteCompleted

Public Event UndeleteCompleted AsyncCompletedEventHandler

public:
 event AsyncCompletedEventHandler^ UndeleteCompleted

Shows how to undelete messages that have been marked as deleted asynchronously.

using System;
using ComponentPro.Net.Mail;

...

// 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");

// ... 
 
// ...  
// You have deleted a message with sequence number 1 and now you wish to undelete it. 
 
// Undelete the message. 
await client.UndeleteAsync(1);

// ...

Console.WriteLine("Message undeleted successfully.");

// Disconnect.
client.Disconnect();

Imports ComponentPro.Net.Mail

...

' 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")

' ... 
 
' ...  
' You have deleted a message with sequence number 1 and now you wish to undelete it. 
 
' Undelete the message. 
Await client.UndeleteAsync(1)

' ...

Console.WriteLine("Message undeleted successfully.")

' Disconnect.
client.Disconnect()

Shows how to undelete messages that have been marked as deleted asynchronously.

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

...

public void DoUndeleteAsync()
{
    // 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.UndeleteCompleted += client_UndeleteCompleted;

    // ...  
    // You have deleted a message with sequence number 1 and now you wish to undelete it. 
 
    // Undelete the message. 
    client.UndeleteAsync(1);

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

void client_UndeleteCompleted(object sender, AsyncCompletedEventArgs e)
{
    // Pop3 client = (Pop3)sender; 
    if (e.Error != null)
        Console.WriteLine("Error: " + e.Error.ToString());
    else 
    {
        Console.WriteLine("Message undeleted successfully.");
    }
}

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

...

Public Sub DoUndeleteAsync()
    ' 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.UndeleteCompleted, AddressOf client_UndeleteCompleted

    ' ...  
    ' You have deleted a message with sequence number 1 and now you wish to undelete it. 
 
    ' Undelete the message. 
    client.UndeleteAsync(1)

    ' ... 
 
    ' Disconnect. 
    client.Disconnect()
End Sub 
 
Private Sub client_UndeleteCompleted(ByVal sender As Object, ByVal e As AsyncCompletedEventArgs)
    ' Pop3 client = (Pop3)sender; 
    If e.Error IsNot Nothing Then 
        Console.WriteLine("Error: " & e.Error.ToString())
    Else 
        Console.WriteLine("Message undeleted successfully.")
    End If 
End Sub

Reference