I hope you will be interested in the C#/LINQ codes found in following pages:

  "Why Functional Programming Matters" solved with C#
  http://www.oki-osk.jp/esc/cs/whyfp.html
  http://www.oki-osk.jp/esc/cs/whyfp2.html
  http://www.oki-osk.jp/esc/cs/whyfp3.html