一个判断语句

   sub showDe_name()
          set rs=server.createobject("ADODB.Recordset")
          sql="select * from [BJ_Business] "         
          rs.open sql,conn,1,1
          if De_name="" then
          response.Write "<form name=""form1"" method=""post"" action="""">"
          response.write "<label>"         
          set rs_C=server.createobject("ADODB.Recordset")
          sql2="select * from [CRS] where SmallClassID=2"
          rs_C.open sql2,conn,1,1
          response.Write "<select name=""Cid"" id=""Cid"">"
          do while not rs_C.eof
          response.Write "<option value=""&rs_C(Cid)&"">"&rs_C("Cname")&"</option>"
          rs_C.movenext
          loop
          rs_C.close
          'set rs_C=nothing         
          response.Write "</select>"
          response.Write "</label>"
          response.write "<label>"
          response.Write "<input type=""submit"" name=""button"" id=""button"" value=""确认"">"
          response.write "</label>"
          response.write "</form>"
          else              
          response.Write rs("De_name")
          rs.close
          set rs=nothing
          end if
    end sub