Setting A Password Policy for a web site in c# 2008

Question

Hi All,

I have a website in c# 2008.

I m assigned a task to set the password policy for this web site.

The password Policy goes as under:
   
1.  1st char is in UpperCase
2.  2nd char is in LowerCase
3.  3rd char is a special char
4.  4th to 8th char are random digits
5.  the password expires after 6 months
6. The password can be only 8 chars.    

This is really URGENT...I m not able to figure this out. Please advise...
Your advise and support are most appreciated.

Thanks & Regards,