dmDisplayFrequency showing 0. Any alternative?

I'm trying to use win32 EnumDisplaySettings to get all available resolutions and refresh rates. But when printing dmDisplayFrequency I always get 0 which means that it cannot get it. Is there any alternatives to enumDisplaySettings ? If windows is able to provide a list in display setting window then there must be another way ?

using System;
using System.Linq;
using System.Runtime.InteropServices;

namespace ListResolutions
{

class Program
{
    [DllImport("user32.dll")]
    public static extern bool EnumDisplaySettings(
          string deviceName, int modeNum, ref DEVMODE devMode);
    const int ENUM_CURRENT_SETTINGS = -1;

    const int ENUM_REGISTRY_SETTINGS = -2;

    [StructLayout(LayoutKind.Sequential)]
    public struct DEVMODE
    {

        private const int CCHDEVICENAME = 0x20;
        private const int CCHFORMNAME = 0x20;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
        public string dmDeviceName;
        public short dmSpecVersion;
        public short dmDriverVersion;
        public short dmSize;
        public short dmDriverExtra;
        public int dmFields;
        public int dmPositionX;
        public int dmPositionY;
        public int dmDisplayFixedOutput;
        public short dmColor;
        public short dmDuplex;
        public short dmYResolution;
        public short dmTTOption;
        public short dmCollate;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
        public string dmFormName;
        public short dmLogPixels;
        public int dmBitsPerPel;
        public int dmPelsWidth;
        public int dmPelsHeight;
        public int dmDisplayFlags;
        public int dmDisplayFrequency;
        public int dmICMMethod;
        public int dmICMIntent;
        public int dmMediaType;
        public int dmDitherType;
        public int dmReserved1;
        public int dmReserved2;
        public int dmPanningWidth;
        public int dmPanningHeight;

    }

    static void Main(string[] args)
    {
        DEVMODE vDevMode = new DEVMODE();
        int i = 0;
        while (EnumDisplaySettings(null, i, ref vDevMode))
        {
            Console.WriteLine("Width:{0} Height:{1} Color:{2} Frequency:{3}",
                                    vDevMode.dmPelsWidth,
                                    vDevMode.dmPelsHeight,
                                    1 << vDevMode.dmBitsPerPel, vDevMode.dmDisplayFrequency
                                );
            i++;
        }
    }

}
}