How to get disk usage (I/O speed) of a foreign process in C#?

Question

Programming

How to get information about disk loading (disk I/O speed) for someone else's process in windows 7 and XP in C#?
Here is an example of how AnVir shows it .

I tried to pull it out through https://msdn.microsoft.com/en-us/library/windows/d... , it gives out not at all what AnVir on XP

foreach (var obj in new ManagementObjectSearcher("SELECT * FROM Win32_PerfFormattedData_PerfProc_Process").Get())
{
       ulong IODataBytesPerSec = (ulong)obj["IODataBytesPerSec"];
}