无效字符的错误

Question

[conn.Open();
                OracleCommand comm = conn.CreateCommand();
                comm.CommandText = "SELECT * FROM FUNCTIONINFO;";
                comm.CommandType = CommandType.Text;
                OracleDataAdapter _adapter = new OracleDataAdapter(comm);
                DataSet _dataset = new DataSet();
                _adapter.Fill(_dataset);
数据库中的类型都是varchar2 不会有什么错误呀

Answer 1

                conn.Open(); 
                OracleCommand comm = conn.CreateCommand(); 
                comm.CommandText = "SELECT * FROM FUNCTIONINFO"; 
                comm.CommandType = CommandType.Text; 
                OracleDataAdapter _adapter = new OracleDataAdapter(comm); 
                DataSet _dataset = new DataSet(); 
              _adapter.Fill(_dataset);