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Good day Janusz,
You've posted your question in the PI .NET Framework (PI AF SDK) space. PIData object belongs to PI SDK, which is targeted for deprecation and hence we strongly recommend all new work be done in AF SDK or PI Web API. The AF SDK equivalent of PIData.Summaries would be the AFCalculation.CalculateSummaries method. To see some examples on PI Square, you may search on AFCalculation.
I look now.
Janusz Graczyk (JaG)