Hi
I created a function and a trigger to solve this problem you can use the fallowing script in dnn6 I don't know if it working for dnn7 or not. you can use any character in line 14 of the code.

let me know if it worked for you 

here is link of the site witch is used this script in http://mahpar.ir

create function fnGenerateTabPath (@tabId int) returns nvarchar(255) as begin declare @path nvarchar(255) set @path='' if(exists(select * from Tabs where ParentID is not null and TabID=@tabid)) begin declare @parentid int set @parentid=(select ParentID from Tabs where TabID=@tabid) set @path=dbo.fnGenerateTabPath(@parentid) end set @path=@path+'//'+(select replace(tabname,' ','-') from Tabs where TabID=@tabid) return @path end GO CREATE TRIGGER [dbo].[trigUpdateTabPath]    ON  [dbo].[Tabs]    AFTER INSERT,UPDATE AS  BEGIN declare @tabid int set @tabid=(select max(TabID) from inserted) UPDATE Tabs SET TabPath=dbo.fngeneratetabpath(@tabid) where Tabs.TabID=@tabid END