Select PerformanceCounterType

See this:

https://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype%28v=vs.110%29.aspx

there is a table in there showing that PerformanceCounterType.SampleFraction needs a denomonator of type PerformanceCounterType.SampleBase

(and RawFraction needs RawBase etc)

C. CounterType = PerformanceCounterType.SampleBase