# C1.LiveLinq.IObservableSource-1.EnableItemOrdinals

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<h1 id="C1_LiveLinq_IObservableSource_1_EnableItemOrdinals_" data-uid="C1.LiveLinq.IObservableSource`1.EnableItemOrdinals*">EnableItemOrdinals Method
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<a id="C1_LiveLinq_IObservableSource_1_EnableItemOrdinals_" data-uid="C1.LiveLinq.IObservableSource`1.EnableItemOrdinals*"></a>
<h4 id="C1_LiveLinq_IObservableSource_1_EnableItemOrdinals" data-uid="C1.LiveLinq.IObservableSource`1.EnableItemOrdinals">EnableItemOrdinals()</h4>
<div class="markdown level1 summary"><p>After this method is called, the collection is required to provide <a class="xref" href="C1.LiveLinq.SourceChangeEventArgs-1.Ordinal.html#C1_LiveLinq_SourceChangeEventArgs_1_Ordinal">Ordinal</a> in event data.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">void EnableItemOrdinals()</code></pre>
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  <pre><code class="lang-vbnet hljs">Sub EnableItemOrdinals()</code></pre>
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