title: Add from one list to another
body: <p>I have been trying to 'transport' the first two elements from list A to list B without copying them.</p>
  
  <p>At the start, list A has four int values. In the end I want List A and B to both have 2 int values.</p>
  
  <p>I'm trying something like this:</p>
  
  <pre><code>int a = 1;
  int b = 2;
  int c = 3;
  int d = 4;
  
  TestA.Add(a);
  TestA.Add(b);
  TestA.Add(c);
  TestA.Add(d);
  
  for (int i=0; i&lt;2; i++)
  {
      TestB.AddRange(TestA[i]);
  }
  </code></pre>
  
  <p>I get a IEnummerable conversion error. I'm sure I'm doing it in a very naive way, and I'd appreciate some help here. Thanks.</p>