DemoExtensions.cs

public static class DemoExtensions{
  public static T Pick<T>(this IEnumerable<T> items){
     /*return random element out of items*/
  }

  public static T Take<T>(this IList<T> items){
    /*thread safe: return random element out of items and remove it*/
  }

  public static IList<T> Times<T>(this int x, Func<int, T> action){
    /*use Parallel.For to execute action x times, aggregate results into a list and return it*/
    /*wrap each execution in a new NHibernate session scope*/
  }

  public static IList<TResult> Each<T, TResult>(this IEnumerable<T> items, Func<T, TResult> action){
    /*use Parallel.each to transform each item in items, aggregate results, return */
    /*wrap each execution in a new NHibernate session scope*/
  }

}