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Returns true if the validation options of all cells represented by this IRange are the same; otherwise, false is returned.
bool ValidationIsSame { get; }
ReadOnly Property ValidationIsSame As Boolean
IRange range = worksheet.Range["A1:A2"];
range.Validation.Add(ValidationType.Whole, ValidationAlertStyle.Stop, ValidationOperator.Between, 1, 10);
bool validationIsSame = range.ValidationIsSame;