title: Adding one Dictionary object to another
body: <p>Is it possible to add one dictionary to another like for example:</p>
  
  <pre><code>Dictionary&lt;string,int&gt; d1=new Dictionary&lt;string,int&gt;()
  {
     {"abc",1}
     {"def",2}
  };
  
  Dictionary&lt;string,string&gt; d2=new Dictionary&lt;string,string&gt;()
  {
     {"str","fgh"}
     {"uyz","ghi"}
  };
  </code></pre>
  
  <p>I need to add <code>d1</code> to <code>d2</code>. Please note that the dictionaries have different signatures.</p>