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Excel calculation mode.
public enum CalculationMode
Automatic = 0
Everything is calculated, recalculate whenever something is changed, and every time a workbook is opened.
Manual = 2
Nothing is calculated, recalculate only when the user explicitly requests it by pressing F9 or CTRL+ALT+F9, or when the workbook is saved.
Semiautomatic = 1
Everything is calculated with the exception of Data Tables and Python formulas.