Here is my single line LINQ solution for ; "Determine if an Integer is a Prime Number" :
var max =100;
var primes = Enumerable.Range(1, max).Where(n => Enumerable.Range(1, n).Where(m => (n/m)*m == n).Count() == 2);
Chelenge:
TekPubs-Mastering-LINQ-Challenge
www.tekpub.com