how to change themes at run time in asp.net

[shashank narayan]

how a person can change his theme at run time
.simply i want to change css at run time . when a user will select any new option he will get a new css on his display. i want ot do this in asp.net.

[MrMancunian]

So what have you done so far?

Steven

[shashank narayan]

i m not having any idea from where i have to start so please guide me.