while(!m_pRecordset->adoEOF)                                                    //判断是否为空

      {

            CString pzhong=(char*)(_bstr_t)m_pRecordset->GetCollect("pz");    //将品种信息存入变量
            CString czhi=(char*)(_bstr_t)m_pRecordset->GetCollect("cz");
CString gge=(char*)(_bstr_t)m_pRecordset->GetCollect("gg");
            m_box_pz.AddString(pzhong);                             //为下拉列表添加品种信息
m_box_cz.AddString(czhi);
m_box_gg.AddString(gge);
            m_pRecordset->MoveNext();                                                       //继续下一条记录

      }    
  
combobox与数据库连接 程序调试到 箭头指到m_box_pz.AddString(pzhong); 再步进就出错了到底是什么原因啊