Need help in building forum

I have my 2 line of code which it will display the name of my board and my treat in forum.

lblHeaderBoard.Text = "<^a href='default.aspx' class='headerLink'>" & myBoard.Name & ""
lblHeaderThread.Text = myThread.Subject

What i trying to do now is like what we always found in forum, there is always a navigation link showing where are we. Now i have a problem of href my thread. when i click on my thread how should it show to back to my board.aspx?
Example is MainForums >> Sub Forum
if now i at the page of
http://.../thread.aspx?BoardId=Adobe%20Photoshop&ThreadId=4

so when i click on Sub Forum it suspose to go back to the below url.
http://.../board.aspx?boardid=Adobe%20Photoshop

I cannot put
"<^a href='board.aspx' class='headerLink'>" & myThread.Subject& "" because it will show error that board are not exists as it actually make a ref to the id.