I can suggest you two options for this,
1) YOu can download Microsoft Scheduler component in the following link and use in your application to schedule mail sending
http://www.gotdotnet.com/Community/U...6-bbdcf1ceb0d1
2) You can create a windwos service application that can use timer to check for the specified time and send mails.
Let me know if you want more about this.
It is not how much we do,
but how much love we put in the doing.
-Mother Theresa