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Wrong Windows Working Set Size


I get process working set size by using System.Environment.WorkingSet and stores it in a variable and named it ENWS,
Then I get same process working set size by using GetProcessMemoryInfo API function and named it APWS,
and also I get same process max working set size with GetProcessWorkingSetSize API function and named it MAPWS,
And questions:

First: MAPWS is very very smaller than APWS and ENWS? Why? And what is different? (different is about 200MB!)
Second: ENWS is different from APWS? Why these two are differ from each other? (different is about 40000 bytes)

Can any one help me?

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