public void AddUniqueIndexOn(string indexName, params string[] indexFields)
{
if (indexFields.Length == 0)
{
throw new OdbRuntimeException(
NDatabaseError.InternalError.AddParameter("Index has to have at least one field"));
}
indexFields = ValidateFields(indexName, indexFields);
_storageEngine.AddIndexOn(_classInfo.FullClassName, indexName, indexFields, false);
}