Oracle database and Unity3d

The same problem is with the connection Oracle.DataAccess.dll connection, therewith all works in mono if you create a console project. What’s the problem? Why unity gives this error?

OracleConnection oracleConnection = new OracleConnection
{
ConnectionString =
“Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=HostMyServer)(PORT=PortMyServer)))(CONNECT_DATA=(SERVICE_NAME=MySID)));User Id=User;Password=Password;”
};
oracleConnection.Open();

NotImplementedException: The requested feature is not implemented.
System.EnterpriseServices.ContextUtil.get_IsInTransaction ()
Oracle.DataAccess.Client.ConnectionDispenser.Open (Oracle.DataAccess.Client.OpoConCtx opoConCtx)
Oracle.DataAccess.Client.OracleConnection.Open ()
(wrapper remoting-invoke-with-check) Oracle.DataAccess.Client.OracleConnection:Open ()
test.Awake () (at Assets/test.cs:37)

import System.EnterpriseServices.dll to Assets filefoder