How to connect C# with Progress OpenEdge 10.1B driver ?

Hi Guys, i was trying to connect C# with Progress OpenEdge 10.1B driver by ODBC. Apparently my connection string is ok, but when i try to connect i get the following error message:

ERROR [HYC00] [DataDirect][ODBC Progress OpenEdge Wire Protocol driver]Optional feature not implemented.
ERROR [HY000] [DataDirect][ODBC Progress OpenEdge Wire Protocol driver][OPENEDGE]Server rejects connection on attach.
ERROR [IM006] [DataDirect][ODBC Progress OpenEdge Wire Protocol driver]Driver's SQLSetConnectAttr failed.

this is my source code:

try

            {

                con = new OdbcConnection("Driver={Progress OpenEdge 10.1B driver}; HOST=x.x.x.x; PORT=20200; DB=Pruebas; DefaultIsolationLevel=READ                                                                      COMMITTED; UID=sysprogress; PWD=sys;");

                con.Open();

                MessageBox.Show("Successfull!");

            }

            catch (Exception e)

            {

                MessageBox.Show("Error: " + e);

            }

I hope you can help us.

Thanks in advance