string strconn="Provider=msdaora;Data Source=MyOracleDB;User Id=UserName;Password=asdasd;" or"Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;User Id=Username;Password=asdasd;" or
"Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;OSAuthent=1;" 然后OleDbConnection oledbcon=new OleDbConnection(strconn);