Creates a DataValidation object which can be set on a Range, Area, or Cell.

 public DataValidation CreateDataValidation(ValidationType allowedType, System.String formula)
Public Function CreateDataValidation(ByVal allowedType As ValidationType, ByVal formula As String) As DataValidation

The data type allowed in the cell.

For 'Custom' allowed type: the formula used to validate the cell's data. For 'List' allowed type: the formula referencing a range in the worksheet.

A DataValidation object.

          DataValidation dataValidation =

          Dim dataValidation As DataValidation = _
               wb.createDataValidation( _
               DataValidation.ValidationType.List, _