为什么出错？数据显示不该这么难吧！！

帮我看看下段代码吧
if (!m_database.IsOpen())
{
try
{
m_database.Open(_T("myDB.mdb"));
}
catch (CDaoException* e)
{
e->Delete();
}
} m_recordset.Open(dbOpenSnapshot, "select * from myTable1", dbReadOnly);
m_myDataGrid.SetRefDataSource(NULL);
try{
m_myDataGrid.SetRefDataSource( (LPUNKNOWN)(&m_recordset));//提示“类型不匹配”
}
catch(...)
{
AfxMessageBox("sdf");
}
m_myDataGrid.Refresh();