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I'm trying to read a number of performance counters from a running .NET 4 application, from another .NET 4 application. Some counters, such as Process\% Processor Time and Process\Private Bytes work fine. However, as soon as I try to read a performance counter from one of the .NET categories, such as .NET CLR Memory\# Gen 0 Collections , I get the following exception: Instance 'MyApplication' does not exist in the specified Category When I call: new PerformanceCounterCategory(".NET CLR Memory").GetInstanceNames() It returns a very small set of instances, and MyApplication is indeed not in the list. However, when I look at my performance counters in perfmon , the list of instances I see there for the same category/counter is much longer and DOES include MyApplication. Does anyone know why the .NET counters are not visible to my application? (Note: The monitored application is started by the monitoring application, so they definitely run in the same user account. I also tried starting my monitoring application as Administrator and adding my account to the Performance Monitor Users group, to no effect.)

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