In my application I have to send periodic heartbeats to a \"brother\" application.
Is this better accomplished with System.Timers.Timer/Threading.Timer or Using a Th
System.Threading.Timer has my vote.
System.Timers.Timer is meant for use in server-based (your code is running as a server/service on a host machine rather than being run by a user) timer functionality.
A Thread with a While loop and Thread.Sleep command is truly a bad idea given the existance of more robust Timer mecahnisms in .NET.