Quote:
..show it to notify icon
It's not clear which notify icon, stll you can try implementing following approaches-
1. Write a program (May be a console application) to fetch date of births from DB and write a logic to filter bithdates with current system date and display the them. Put the exe file in Startup folder.
2. Write a windows service and on code the same logic and make sure that logic gets executed
OnStart event. Design a windows form and display this form with data on this event call.
You can check the following article if your requirement matches with it.
Birthday Reminder in C#[
^]
Hope, it helps :)