Verrek, het filteren op "à la ferme" lukt niet! Ik krijg een foutmelding!!
Server Error in '/' Application.
Invalid column name 'class'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Invalid column name 'class'.
Etc, etc......