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Returns an instance of IValidation which may be used to get and set validation properties of the cells represented by this IRange.
IValidation Validation { get; }
ReadOnly Property Validation As IValidation
IRange range = worksheet.Range["A1"];
IValidation validation = range.Validation;
validation.Add(ValidationType.Whole, ValidationAlertStyle.Stop, ValidationOperator.Between, 1, 10);
bool hasValidation = range.HasValidation;