# C1.DataCollection.C1SpanDataCollection-1.OnSourceCollectionChanged

## Content

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<h1 id="C1_DataCollection_C1SpanDataCollection_1_OnSourceCollectionChanged_" data-uid="C1.DataCollection.C1SpanDataCollection`1.OnSourceCollectionChanged*">OnSourceCollectionChanged Method
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<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="C1_DataCollection_C1SpanDataCollection_1_OnSourceCollectionChanged_" data-uid="C1.DataCollection.C1SpanDataCollection`1.OnSourceCollectionChanged*"></a>
<h4 id="C1_DataCollection_C1SpanDataCollection_1_OnSourceCollectionChanged_System_Object_System_Collections_Specialized_NotifyCollectionChangedEventArgs_" data-uid="C1.DataCollection.C1SpanDataCollection`1.OnSourceCollectionChanged(System.Object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)">OnSourceCollectionChanged(object?, NotifyCollectionChangedEventArgs)</h4>
<div class="markdown level1 summary"><p>Called when the source collection changed.</p>
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<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">protected override void OnSourceCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)</code></pre>
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  <pre><code class="lang-vbnet hljs">Protected Overrides Sub OnSourceCollectionChanged(sender As Object, e As NotifyCollectionChangedEventArgs)</code></pre>
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<h5 class="parameters">Parameters</h5>
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  <thead>
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      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></td>
      <td><span class="parametername">sender</span></td>
      <td><p>The sender.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.specialized.notifycollectionchangedeventargs">NotifyCollectionChangedEventArgs</a></td>
      <td><span class="parametername">e</span></td>
      <td><p>The <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.specialized.notifycollectionchangedeventargs">NotifyCollectionChangedEventArgs</a> instance containing the event data.</p>
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    </tr>
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<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="C1.DataCollection.C1WrapDataCollection-2.OnSourceCollectionChanged.html#C1_DataCollection_C1WrapDataCollection_2_OnSourceCollectionChanged_System_Object_System_Collections_Specialized_NotifyCollectionChangedEventArgs_">C1WrapDataCollection&lt;T, T&gt;.OnSourceCollectionChanged(object, NotifyCollectionChangedEventArgs)</a></div>
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