ASP.Net/SQL dynamically add Drop down list items based on the value of a Session

Question

I'm trying to add items to my drop down list depending on a Session or String

Session("number_slept") = "8"

or

strNumberSlept = "8"

So if that equals 8 i want to show 8 drop down list items and if it's 2 then only show 2 items etc. but I can't figure out how to do this

Any ideas

Thanks

Jamie