Hi,
You can use
Calendar DayView Control[
^]. this will do schedule for your alert.
Now your next step is to store this Date and Time information along with the UserId in the database.
In your Form you can create one
Timer and With every Tic event of Timer control you can fetch data from the database. This data would be the reminders. Once user click on the Disclaim button that reminder will not popup anymore.
Hope i answered your query.
Thanks
-Amit Gajjar