Start task service in c# using Task Scheduler .dll

Question

I am using Microsoft.Win32.TaskScheduler.dll and i want to create a task service once only that runs the task for each 1 minute and on completation of task restarts itself but on running it creates mutliple task service and each running their task every minute, i am calling this in main method , i just want the task service if there is no instance of it else do nothing.