Microsoft.Phone.Info namespace not work for wp8.1

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C#

Windows

WinMobile

I am tring to fetch device specification, for this i need to implement Microsoft.Phone.Info namespace, it is perfectly working in wp8 but it is not work in windows phone 8.1
Is Anyone can tell me whats the alternative i can use in 8.1 or how to use this in 8.1
using Microsoft.Phone.Info;

private void btnok_Click(object sender, RoutedEventArgs e)
{
        string deviceDetails = "Device details are::";
        deviceDetails += DeviceStatus.ApplicationCurrentMemoryUsage +",";
        deviceDetails += DeviceStatus.ApplicationMemoryUsageLimit + ",";
        deviceDetails += DeviceStatus.ApplicationPeakMemoryUsage + ",";
        deviceDetails += DeviceStatus.DeviceFirmwareVersion + ",";
        deviceDetails += DeviceStatus.DeviceHardwareVersion + ",";
        deviceDetails += DeviceStatus.DeviceManufacturer + ",";
        deviceDetails += DeviceStatus.DeviceName + ",";
        deviceDetails += DeviceStatus.DeviceTotalMemory + ",";
        deviceDetails += DeviceStatus.PowerSource;
 
        MessageBox.Show(deviceDetails);
        //to know whether device supports smooth streaming of multi resolution video
        if (MediaCapabilities.IsMultiResolutionVideoSupported)
        {
             MessageBox.Show("Supported");
        }
        else
        {
             MessageBox.Show("Not supported");
        }
 
}