# C1.DataCollection.IDataCollectionEx.IndexOf

## Content

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<h1 id="C1_DataCollection_IDataCollectionEx_IndexOf_" data-uid="C1.DataCollection.IDataCollectionEx.IndexOf*">IndexOf Method
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<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="C1_DataCollection_IDataCollectionEx_IndexOf_" data-uid="C1.DataCollection.IDataCollectionEx.IndexOf*"></a>
<h4 id="C1_DataCollection_IDataCollectionEx_IndexOf__1_C1_DataCollection_IDataCollection___0____0_" data-uid="C1.DataCollection.IDataCollectionEx.IndexOf``1(C1.DataCollection.IDataCollection{``0},``0)">IndexOf&lt;T&gt;(IDataCollection&lt;T&gt;, T)</h4>
<div class="markdown level1 summary"><p>Gets the index of the specified item.</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">public static int IndexOf&lt;T&gt;(this IDataCollection&lt;T&gt; dataCollection, T item) where T : class?</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Shared Function IndexOf(Of T As Class)(dataCollection As IDataCollection(Of T), item As T) As Integer</code></pre>
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<h5 class="parameters">Parameters</h5>
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  <thead>
    <tr>
      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="C1.DataCollection.IDataCollection-1.html">IDataCollection</a>&lt;T&gt;</td>
      <td><span class="parametername">dataCollection</span></td>
      <td><p>The data collection.</p>
</td>
    </tr>
    <tr>
      <td><span class="xref">T</span></td>
      <td><span class="parametername">item</span></td>
      <td><p>The item that will be searched.</p>
</td>
    </tr>
  </tbody>
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<h5 class="returns">Returns</h5>
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  <thead>
    <tr>
      <th>Type</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td></td>
    </tr>
  </tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
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  <thead>
    <tr>
      <th>Name</th>
      <th>Description</th>
    </tr>
  </thead>
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    <tr>
      <td><span class="parametername">T</span></td>
      <td></td>
    </tr>
  </tbody>
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