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    copied!<p>If you want to add all entries from <code>AftList2</code> to <code>lstAux</code> you should define <code>AftList2</code> as IEnumerable&lt;> with elements of type <code>DetalleCita</code> (being <code>IEnumerable&lt;DetalleCita&gt;</code> is enough to be used as parameter of <code>AddRange()</code> on <code>List&lt;DetalleCita&gt;</code>). For example like this:</p> <pre><code>var AftList2 = GridData2.Values.Where(r =&gt; r != null).Cast&lt;DetalleCita&gt;(); </code></pre> <p>And then you can add all its elements to <code>lstAux</code>:</p> <pre><code>lstAux.AddRange(AftList2); </code></pre> <p>Clarification:</p> <p>I think you are misunderstanding what extension method <code>ToList()</code> does. It <strong>creates</strong> new list from <code>IEnumerable&lt;T&gt;</code> and its result is not connected with original <code>IEnumerable&lt;T&gt;</code> that it is applied to.</p> <p>That is why you are just do nothing useful trying to do <code>list.ToList().AddRange(...)</code> - you are copying list to (another newly created by <code>ToList()</code>) list, update it and then basically throwing away it (because you are not even doing something like <code>list2 = var1.ToList()</code>, original <code>var1</code> stays unchanged after that!!! you most likely want to save result of <code>ToList()</code> if you are calling it).</p> <p>Also you don't usually need to convert one list to another list, <code>ToList()</code> is useful when you need list (<code>List&lt;T&gt;</code>) but have <code>IEnumerable&lt;T&gt;</code> (that is not indexable and you may need fast access by index, or lazy evaluates but you need all results calculated at this time -- both situations may arise while trying to use result of LINQ to objects query for example: <code>IEnumerable&lt;int&gt; ints = from i in anotherInts where i &gt; 20 select i;</code> -- even if <code>anotherInts</code> was <code>List&lt;int&gt;</code> result of query <code>ints</code> <strong>cannot be cast</strong> to <code>List&lt;int&gt;</code> because it is not list but implementation of <code>IEnumerable&lt;int&gt;</code>. In this case you could use <code>ToList()</code> to get list anyway: <code>List&lt;int&gt; ints = (from i in anotherInts where i &gt; 20 select i).ToList();</code>).</p> <p>UPDATE:</p> <p>If you really mean union semantics (e.g. for { 1, 2 } and { 1, 3 } <em>union</em> would be something like { 1, 2, 3 }, with no duplication of equal elements from two collections) consider switching to <code>HashSet&lt;T&gt;</code> (it most likely available in your situation 'cause you are using C# 3.0 and I suppose yoou have recent .NET framework) or use <code>Union()</code> extension method instead of <code>AddRange</code> (I don't think this is better than first solution and be careful because it works more like <code>ToList()</code> -- <code>a.Union(b)</code> return new collection and does NOT updates either <code>a</code> or <code>b</code>).</p>
 

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