Window Service

part1: http://www.youtube.com/watch?v=RSHWX2jPMyA&feature=related
part2:http://www.youtube.com/watch?v=31WtOj0lpVU
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http://www.youtube.com/watch?v=a2J_XZW2S4I
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example:
Birthday Wish Scheduler in C#:
http://www.c-sharpcorner.com/UploadFile/prvn_131971/BirthdayWishScheduler02022006012557AM/BirthdayWishScheduler.aspx