Chained null checks- as explained in http://www.codeproject.com/Articles/109026/Chained-null-checks-and-the-Maybe-monad

ChainedNullChecks.cs

public static TResult With<TInput, TResult>(this TInput o,
                Func<TInput, TResult> evaluator)
    where TResult : class
    where TInput : class
{
    if (o == null) return null;
    return evaluator(o);
}

public static TResult Return<TInput, TResult>(this TInput o,
                Func<TInput, TResult> evaluator,
                TResult failureValue) where TInput : class
{
    if (o == null) return failureValue;
    return evaluator(o);
}