C#: Convert Dictionary<> to NameValueCollection

Question

How can I convert a Dictionary to a NameValueCollection?

The existing functionality of our project returns an old-fashion

Answer 1

And if you like LINQ:

Dictionary to NameValueCollection

return dictionary.Aggregate(new NameValueCollection(),
    (seed, current) => { 
        seed.Add(current.Key, current.Value);
        return seed;
    });

NameValueCollection to Dictionary

(source)

return source.Cast()  
    .ToDictionary(s => s, s => source[s]);