# GrapeCity.Win.Spread.InputMan.CellType.GcNumberEditingControl.OnDropDownOpening

## Content

<div class="doc-site-dotnet-api-container">



<h1 id="GrapeCity_Win_Spread_InputMan_CellType_GcNumberEditingControl_OnDropDownOpening_" data-uid="GrapeCity.Win.Spread.InputMan.CellType.GcNumberEditingControl.OnDropDownOpening*">OnDropDownOpening Method
</h1>
<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="GrapeCity_Win_Spread_InputMan_CellType_GcNumberEditingControl_OnDropDownOpening_" data-uid="GrapeCity.Win.Spread.InputMan.CellType.GcNumberEditingControl.OnDropDownOpening*"></a>
<h4 id="GrapeCity_Win_Spread_InputMan_CellType_GcNumberEditingControl_OnDropDownOpening_GrapeCity_Win_Spread_InputMan_CellType_DropDownOpeningEventArgs_" data-uid="GrapeCity.Win.Spread.InputMan.CellType.GcNumberEditingControl.OnDropDownOpening(GrapeCity.Win.Spread.InputMan.CellType.DropDownOpeningEventArgs)">OnDropDownOpening(DropDownOpeningEventArgs)</h4>
<div class="markdown level1 summary"><p>Raises the <span class="xref">GrapeCity.Win.Spread.InputMan.CellType.GcNumber.DropDownOpening</span> event.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">protected override void OnDropDownOpening(DropDownOpeningEventArgs e)</code></pre>
</div>
<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Protected Overrides Sub OnDropDownOpening(e As DropDownOpeningEventArgs)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-condensed">
  <thead>
    <tr>
      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="GrapeCity.Win.Spread.InputMan.CellType.DropDownOpeningEventArgs.html">DropDownOpeningEventArgs</a></td>
      <td><span class="parametername">e</span></td>
      <td><p>A <a class="xref" href="GrapeCity.Win.Spread.InputMan.CellType.DropDownOpeningEventArgs.html">DropDownOpeningEventArgs</a> instance that contains the event data.</p>
</td>
    </tr>
  </tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="GrapeCity.Win.Spread.InputMan.CellType.DropDownOpeningEventArgs.html">GcNumber.OnDropDownOpening(DropDownOpeningEventArgs)</a></div>
<h5 id="GrapeCity_Win_Spread_InputMan_CellType_GcNumberEditingControl_OnDropDownOpening_GrapeCity_Win_Spread_InputMan_CellType_DropDownOpeningEventArgs__remarks">Remarks</h5>
<div class="markdown level1 remarks"><p>Raising an event invokes the event handler through a delegate.
The OnDropDownOpening method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
<br><b>Notes to Inheritors:</b> When overriding OnDropDownOpening in a derived class, be sure to call the base class's OnDropDownOpening method so that registered delegates receive the event.</p>
</div>
</div>