I think solved the problem:
ASP.NET 2.0 + MySQL Connector 1.0.7 + Medium Trust Level
http://forums.mysql.com/read.php?38,95478,95478#msg-95478
ASP.NET 2.0 + MySQL Connector 1.0.7 + Medium Trust Level
http://forums.mysql.com/read.php?38,95478,95478#msg-95478