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Dim engine As GridFormulaEngine = CType(Me.grdCB_CCpSI.CellModels("FormulaCell"), GridFormulaCellModel).Engine
engine.RecalculateRange(GridRangeInfo.Table())
But unless you can somehow reduce size of the range you pass in (maybe because you know exactly where the affected formulas will be and only pass in that range), then just updating data using the indexers so the events are raised so the formulaengine can do the updating for you may be more efficient.