Performance Counter by Process ID instead of name?

Question

I am tracking multiple instances of the same application and need to get the memory and cpu use of both processes. However, I cant seem to figure out a way to use the performance counter and know which result is for which process. I have seen that I can append #1 and such to the end of the name to get results for each, but that doesn't tell me which one is for which process.

How can I determine the ProcessId or pass the process ID to the counter to get the result per each process with same name?

PerformanceCounterCPU.CategoryName = "Process";
PerformanceCounterCPU.CounterName = "% Processor Time";
PerformanceCounterCPU.InstanceName = proc.ProcessHandle.ProcessName;

PerformanceCounterMemory.CategoryName = "Process";
PerformanceCounterMemory.CounterName = "Working Set - Private";
PerformanceCounterMemory.InstanceName = proc.ProcessHandle.ProcessName;

Answer 1

This answer to a related question might work:

private static string GetProcessInstanceName(int pid) {   PerformanceCounterCategory cat = new PerformanceCounterCategory("Process");    string[] instances = cat.GetInstanceNames();   foreach (string instance in instances)   {       using (PerformanceCounter cnt = new PerformanceCounter("Process",             "ID Process", instance, true))      {         int val = (int) cnt.RawValue;         if (val == pid)         {            return instance;         }      }   }   throw new Exception("Could not find performance counter " +        "instance name for current process. This is truly strange ..."); } 

Answer 2

If you don't mind a machine-wide registry change, you can configure Windows to use the form ProcessName_ProcessID for Perf Counter instance names, rather than appending #1, #2, etc:

Create DWORD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PerfProc\Performance\ProcessNameFormat and set its value to 2.

If you do stick with the #1, #2 etc form, beware that the instance name for a given process can change during the process' lifetime!