Question

I have Windows server with PostgreSQL database. I stored in the database employees data including contract expiry date.
I would like to send an automatic email for each employee 30 days before the expiry date. (Each employee has an email account).
What is the best way to do that?
I am thinking to do the following, Could you please advise if it is the best way, and if, I need answer for the questions:

• Build WinForm C# application doing:

• Access PostgreSQL everyday( I know how to deal with Postgresql, but how to make it per each new day (schedule task?)?)

• Compare machine date with all expiry date in the database

• If the difference equals or less than 30 days, an automatic mail will
  be send to the employee. (how to send emails using C#}

Answer 1

AS @Middas proposed, writing a simple console application would take the responsibility of scheduling outside the application.

A simple console application is OK, scheduled by either Windows Scheduler or a 3rd party scheduler would do.

For sending emails, you could

• use .net provided SMTPClient namespace to send emails
• use 3rd party service like Amazon SES