using (var ts = new TaskService())
{
    ts.RootFolder.DeleteTask("MyTask", false);

    var td = ts.NewTask();
    td.RegistrationInfo.Description = $"MyTask";

    td.Actions.Add(new ExecAction(@"C:\Windows\System32\cmd.exe", $@"start /b /wait cmd /c ""{scriptPath} >{outputPath} 2>&1""", workingDir));
    td.Principal.RunLevel = TaskRunLevel.Highest;
    td.Settings.Priority = ProcessPriorityClass.High;

    var task = ts.RootFolder.RegisterTaskDefinition("MyTask", td, TaskCreation.CreateOrUpdate, user, pass, TaskLogonType.Password);

    task.Run();

    return task;
}