It is somewhat abandoned.
Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum. http://projecteuler.net/index.php?section=problems&id=6
My Solution:
var x =
(
from a in 1.To(Int32.MaxValue)
from b in 1.To(a)
where a + b + Math.Sqrt(a * a + b * b) == 1000
select new { A = a, B = b, C = Math.Sqrt(a * a + b * b) }
).First();