public IReadOnlyDictionary<long,string> Validate( 
   Selection selection
)

Public Overloads Function Validate( _
   ByVal selection As Selection _
) As IReadOnlyDictionary(Of Long,String)

A read-only dictionary that holds zero or more key/value pairs where the existence of each key represents the object ID of the row that fails to validate and the value represents the corresponding error message. If validation succeeds, the returned read-only dictionary is empty.