Security Thoughts:

There are generally three types of authorization in enterprise applications:

1. Role based security - Which actions can a user do - aka role-based access control
2. Entity level security - A user can only perform an Action on certain objects/data - aka row level security
3. Field level security - A user can see or edit only certain fields of an entity – (this is really fine grained and usually a bad idea)

Haskell has parsec, f# has fparsec. I went searching for a good option for creating parsers in c#.

A permutation is an ordered arrangement of objects. For example, 3124 is one possible permutation of the digits 1, 2, 3 and 4. If all of the permutations are listed numerically or alphabetically, we call it lexicographic order. The lexicographic permutations of 0, 1 and 2 are:

012   021   102   120   201   210

What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?

Discover the largest product of five consecutive digits in the 1000-digit number.

http://projecteuler.net/index.php?section=problems&id=8

“There are only two hard problems in computer science: cache invalidation, naming things, and off-by-one errors.”

I am a big fan of postsharp and its creator Gael.  There are a number of examples floating around of doing caching with postsharp.  However, none handled cache invalidation in a nice declarative way.