, Dr Herbie wrote

Basic solution for multiple alarms:  Have a single timer that fires at appropriate intervals (depending on the accuracy or your alarms that could be every second or every minute).  When the timer fires, check a list of alarm times to see if you have reached one yet; if so show the alarm message to the user.



My basic solution would be to use the quartz scheduler. Written well (the .NET port), tried and tested so relatively bug free.