Just to make a correction: DLL is added as a reference...
sqlca.DBMS = "ADO.NET"
sqlca.LogID = "sysdba"
sqlca.LogPass = "masterkey"
sqlca.DBParm = "Namespace='FirebirdSQL.Data.FirebirdClient.dll',DataSource='localhost', 'Database=localhost:C:\\IDBREFRW.FDB'"
connect using sqlca;
Has the DBMS still be set to ADO.NET?