title: C#: Convert Dictionary<> to NameValueCollection
body: <p>How can I convert a <code>Dictionary&lt;string, string&gt;</code> to a <code>NameValueCollection</code>?</p>
  
  <p>The existing functionality of our project returns an old-fashioned <code>NameValueCollection</code> which I modify with LINQ. The result should be passed on as a <code>NameValueCollection</code>.</p>
  
  <p>I want to solve this in a generic way. Any hints?</p>