C# wmi task schedular code not working on windows7

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C#

Visual-Studio

hey guys i have been trying from several days to code in C# to display all running task from task schedular but seems i am not succeeding in the same in case of OS win7 and the same code runs efficiently in win 8.1 OS.code is written below using wmi object. please if any one has alternative to this do share its a bit urgent.

using System;
using System.Management;
using System.Windows.Forms;

namespace WMISample
{
    public class MyWMIQuery
    {
        public static void Main()
        {
            try
            {
                ManagementObjectSearcher searcher = 
                    new ManagementObjectSearcher("root\\Microsoft\\Windows\\TaskScheduler", 
                    "SELECT * FROM MSFT_ScheduledTask WHERE State = 4"); 

                foreach (ManagementObject queryObj in searcher.Get())
                {
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("MSFT_ScheduledTask instance");
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("State: {0}", queryObj["State"]);
                    Console.WriteLine("TaskName: {0}", queryObj["TaskName"]);
                }
            }
            catch (ManagementException e)
            {
                MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
            }
        }
    }
}

Note:state=4 stands for state running