C＃
Console.WriteLine("Attachment name is " + msg.Attachments[0].Name);
VB.NET
Console.WriteLine("Attachment name is " + msg.Attachments(0).Name)

C＃
Pop3 pop = new Pop3();
// Download entire message
MailMessage msg = pop.DownloadEntireMessage(1);
if (msg.HasAttachments)
{
        // The message has at least one attachment
}

VB.NET
Dim pop As New Pop3()
' Download entire message
Dim msg As MailMessage =  pop.DownloadEntireMessage(1) 
if (msg.HasAttachments) Then
        ' The message has at least one attachment
End If