net通过oledb和ibm自带连接方式，连接db2数据库出错

    第一种通过ibm方式连接       
DataSet ds &＃61; new DataSet();
            OleDbConnection cn &＃61; new OleDbConnection(
              "Provider&＃61;IBMDA400.1;Data Source&＃61;192.168.21.10;User ID&＃61;b4dd;" &＃43;
             "Password&＃61;b4dd;Default Collection&＃61;QIBMPP");
            cn.Open();
            OleDbDataAdapter adp &＃61; new OleDbDataAdapter("select * from qibmpp.CUSTOM", cn);
            adp.Fill(ds,"0");
            if (ds.Tables.Count > 0)
            {
                dataGridView1.Refresh();
                this.dataGridView1.DataSource &＃61; ds.Tables[0].DefaultView;
            }
请高手帮忙看看&＃xff0c;这个为何显示如下错误&＃xff1f;
       “IBMDA400.1”失败&＃xff0c;没有可用的错误消息&＃xff0c;结果代码: E_UNEXPECTED(0x8000FFFF)。



另一种通过oledb连接
            DataSet ds &＃61; new DataSet();
            OleDbConnection Conn &＃61; new OleDbConnection("Provider&＃61;IBMDA400.DataSource.1;Data    Source&＃61;ibm.com.cn;Persist Security Info&＃61;True;User ID&＃61;sss;PASSWORD&＃61;ssss");
            Conn.Open();
            OleDbDataAdapter adp &＃61; new OleDbDataAdapter("select * from QIBMPP.CUSTOM", Conn);
            //adp.Fill(ds,"cust");
            adp.Fill(ds, "CUSTOM");
            if (ds.Tables.Count > 0)
            {
                dataGridView1.Refresh();
                this.dataGridView1.DataSource &＃61; ds.Tables[0].DefaultView;

            }
提示如下错误&＃xff1f;
尝试读取或写入受保护的内存。这通常指示其他内存已损坏。


求高手帮忙解决&＃xff1f;谢谢&＃xff0c;在线等