# C1.Win.C1Input.C1DropDownControl.DropDownOpening

## Content

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<h1 id="C1_Win_C1Input_C1DropDownControl_DropDownOpening" data-uid="C1.Win.C1Input.C1DropDownControl.DropDownOpening" class="text-break">DropDownOpening Event
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<div class="markdown level0 summary"><p>Occurs just before the dropdown is opened.</p>
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<div class="markdown level0 conceptual"></div>
<h6><strong>Namespace</strong>: <a class="xref" href="C1.Win.C1Input.html">C1.Win.C1Input</a></h6>
<h6><strong>Assembly</strong>: C1.Win.C1Input.4.8.dll</h6>
<h5 id="C1_Win_C1Input_C1DropDownControl_DropDownOpening_syntax">Syntax</h5>
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  <pre><code class="lang-csharp hljs">[Obsolete(&quot;DropDownOpening is Obsolete. Use BeforeDropDownOpen instead.&quot;)]
[Browsable(false)]
public event EventHandler DropDownOpening</code></pre>
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<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">&lt;Obsolete(&quot;DropDownOpening is Obsolete. Use BeforeDropDownOpen instead.&quot;)&gt;
&lt;Browsable(False)&gt;
Public Event DropDownOpening As EventHandler</code></pre>
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<h5 class="returns">Returns</h5>
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    <tr>
      <th>Type</th>
      <th>Description</th>
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  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.eventhandler">EventHandler</a></td>
      <td>Occurs just before the dropdown is opened.</td>
    </tr>
  </tbody>
</table>
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