How to check schedule task every three second and print second in label using c#

Question

I want to run my schedule task after 3 second, for that i have written code in my WPF application.

 using (var ts = new TaskService())
 { 
     TaskDefinition td = ts.NewTask();
     td.Settings.MultipleInstances = TaskInstancesPolicy.IgnoreNew;
     td.RegistrationInfo.Description = "TestAPP";

     var trigger = new TimeTrigger();
     trigger.Repetition.Interval = TimeSpan.FromSeconds(3000);
     lblProcess.Content = DateTime.Now.Second; //print current second in a label. 
     td.Triggers.Add(trigger);

     td.Actions.Add(new ExecAction(System.Reflection.Assembly.GetExecutingAssembly().Location, null, System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location)));

     ts.RootFolder.RegisterTaskDefinition(@"TestTask", td);
 }

Here i want to check that after ruining from VS, it will run every 3 second or not, so I've print current second to the label lblProcess .

But it does not updated on every 3 second, Am I doing anything wrong?

EDIT-1:

I've read this before : Creating Scheduled Tasks

There is nothing like to how to check.

Edit-2:

If i use 3.0 instead of 3000 then it's give me an error.

Specified argument was out of the range of valid values.Parameter name: Interval

Answer 1

TimeSpan.FromSeconds(3);

When passing 3000 you input 3000 seconds.

https://msdn.microsoft.com/en-us/library/system.timespan.fromseconds(v=vs.110).aspx

Answer 2

您不能在任务计划程序中设置间隔少于一分钟