# C1.DataCollection.C1DataCollectionList-1.CollectionChanged

## Content

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<h1 id="C1_DataCollection_C1DataCollectionList_1_CollectionChanged" data-uid="C1.DataCollection.C1DataCollectionList`1.CollectionChanged" class="text-break">CollectionChanged Event
</h1>
<div class="markdown level0 summary"><p>Occurs after the items in the collection changed.</p>
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<div class="markdown level0 conceptual"></div>
<div class="implements">
  <h5>Implements</h5>
  <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.specialized.inotifycollectionchanged.collectionchanged">CollectionChanged</a></div>
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<h6><strong>Namespace</strong>: <a class="xref" href="C1.DataCollection.html">C1.DataCollection</a></h6>
<h6><strong>Assembly</strong>: C1.DataCollection.dll</h6>
<h5 id="C1_DataCollection_C1DataCollectionList_1_CollectionChanged_syntax">Syntax</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">public event NotifyCollectionChangedEventHandler? CollectionChanged</code></pre>
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<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Event CollectionChanged As NotifyCollectionChangedEventHandler</code></pre>
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<h5 class="returns">Returns</h5>
<table class="table table-bordered table-condensed">
  <thead>
    <tr>
      <th>Type</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.specialized.notifycollectionchangedeventhandler">NotifyCollectionChangedEventHandler</a></td>
      <td>Occurs after the items in the collection changed.</td>
    </tr>
  </tbody>
</table>
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