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    <p>You need to re move the <code>[XmlElement]</code> tags from your lists. Otherwise it works with a different XML structure.</p> <p>For example, rather than nest all your <code>Artiest</code> objects within a single <code>Artiesten</code> element (which is what your current XML is), it will actually set them adjacent to each other like this:</p> <pre><code> &lt;Artiesten artiestid="1"&gt; &lt;Naam&gt;Harry&lt;/Naam&gt; &lt;Albums&gt; &lt;Album albumid="1"&gt; &lt;Titel&gt;Album1&lt;/Titel&gt; &lt;prijs valuta="Euro"&gt;19.99&lt;/prijs&gt; &lt;uitgiftejaar&gt;1999&lt;/uitgiftejaar&gt; &lt;Nummers&gt; &lt;Nummer nummerid="1"&gt; &lt;titel&gt;happy Sundays&lt;/titel&gt; &lt;duur&gt;PT02M02S&lt;/duur&gt; &lt;/Nummer&gt; &lt;/Nummers&gt; &lt;/Album&gt; &lt;/Albums&gt; &lt;/Artiesten&gt; &lt;Artiesten artiestid="2"&gt; &lt;Naam&gt;Harry&lt;/Naam&gt; &lt;Albums&gt; &lt;Album albumid="1"&gt; &lt;Titel&gt;Album1&lt;/Titel&gt; &lt;prijs valuta="Euro"&gt;19.99&lt;/prijs&gt; &lt;uitgiftejaar&gt;1999&lt;/uitgiftejaar&gt; &lt;Nummers&gt; &lt;Nummer nummerid="1"&gt; &lt;titel&gt;happy Sundays&lt;/titel&gt; &lt;duur&gt;PT02M02S&lt;/duur&gt; &lt;/Nummer&gt; &lt;/Nummers&gt; &lt;/Album&gt; &lt;/Albums&gt; &lt;/Artiesten&gt; &lt;Artiesten artiestid="3"&gt; &lt;Naam&gt;Harry&lt;/Naam&gt; &lt;Albums&gt; &lt;Album albumid="1"&gt; &lt;Titel&gt;Album1&lt;/Titel&gt; &lt;prijs valuta="Euro"&gt;19.99&lt;/prijs&gt; &lt;uitgiftejaar&gt;1999&lt;/uitgiftejaar&gt; &lt;Nummers&gt; &lt;Nummer nummerid="1"&gt; &lt;titel&gt;happy Sundays&lt;/titel&gt; &lt;duur&gt;PT02M02S&lt;/duur&gt; &lt;/Nummer&gt; &lt;/Nummers&gt; &lt;/Album&gt; &lt;/Albums&gt; &lt;/Artiesten&gt; </code></pre> <p>So try redefining your classes as such:</p> <pre><code>[Serializable] [XmlRoot(ElementName = "Collection")] public class Collection { public Collection() { Artiesten = new List&lt;Artiest&gt;(); Albums = new List&lt;Album&gt;(); Nummers = new List&lt;Nummer&gt;(); } public List&lt;Artiest&gt; Artiesten { get; set; } public List&lt;Album&gt; Albums { get; set; } public List&lt;Nummer&gt; Nummers { get; set; } } [Serializable] public class Artiest { [XmlAttribute("artiestid")] public int ArtiestId { get; set; } [XmlElement(ElementName = "Naam")] public String Naam { get; set; } public List&lt;Album&gt; Albums { get; set; } } </code></pre>
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