try
    {
        CoInitialize(NULL);
        _ConnectionPtr  m_pConnection;

        m_pConnection.CreateInstance(__uuidof(_Connection));

        m_pConnection->ConnectionString = "Provider=SQLOLEDB.1;Password=qxd5024278;Persist Security Info=False;User ID=qxd;Data Source=QIN-PC\SQLEXPRESS";
        m_pConnection->Open("","","",NULL);
    }
    catch(_com_error e)   
    {   
        CString str = e.ErrorMessage();  
        MessageBox(str);
    }