急，急，急，两个表连接查询出错问题？？？？？？？

[网_风]

"select a.CL_Name,b.FC_CID from XY_ForClass b join XY_Class a on b.FC_UID='"+Request.Cookies["ylyzuser_id"].Value.ToString()+"' and b.FC_CID=a.CL_ID"

System.Data.OleDb.OleDbException: FROM子句语法错误。