Help Me Urgent

HI to All,

Happy Newyear 

Any one Know how to use DeliveryNotificationOptions in system.net.mailmessage

and here is coding :

 
For i = 0 To mail.Length - 1
toaddress = mail(i)

TextBox2.Text = toaddress

address = TextBox2.Text
Dim objmm As New MailMessage
...