Here is the use case: - Create a new win task, run immediately and once complete, delete the task.

Here is basic code to create a task using C#.

    using (TaskService ts = new TaskService(null))
    {
        string projectName = "runnowtest" + Guid.NewGuid().ToString();

        //create new task
        TaskDefinition td = ts.NewTask();
        Trigger mt = null;

        //setup task as Registration trigger
        mt = td.Triggers.AddNew(TaskTriggerType.Registration);
        mt.StartBoundary = DateTime.Now;

        //delete the task 1 minute after the program ends
        td.Settings.DeleteExpiredTaskAfter = new TimeSpan(0, 1, 0); 

        //run the notepad++ in the task
        td.Actions.Add(new ExecAction("notepad.exe"));

        //register task
        Task output = ts.RootFolder.RegisterTaskDefinition(projectName, td);

        //check output
        Console.WriteLine(output != null ? "Task created" : "Task not created");
    }

The API doesn't seem to have a property/flag to mark task as run once. I am trying to ensure the above task runs only once and deletes immediately after that. Any thoughts are much appreciated!