Loading the Page According to the Selected Value in Dropdown List

Hello there,

I'm a beginner in ASP.net.
I'm developing a online library application(WEB App) using c# in VS 2010-Professional.

According to my site, when i click on registration link there is a drop down list which includes two values
1.Faculty
2.Student
When the user selects on faculty, it must load the registration page corresponding to faculty.
I have enabled 'autopostback' and gave the value (at faculty item) to be regf.aspx(which is my faculty registration page). But when i run it(and select 'faculty' from the dropdown list) its not loading the required page.

Can any one help me out with this ??????