Hi,

How could I make control response to IDataErrorInfo for custom field?



Thank you

It will work if your custom field has a field within the DataTable in the BO.  If you have a custom property that does not pull from the internal data table of the BO then it will not return an error.  The same applies for the broken rule.  So at present, without having another object, you would have to add the field to the SELECT or manually to the data table using the Columns collection of the CurrentDatatable.  Once the field exists, then you can just add a broken rule: