# GrapeCity.Spreadsheet.ExternalVariable.Volatile

## Content

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<h1 id="GrapeCity_Spreadsheet_ExternalVariable_Volatile_" data-uid="GrapeCity.Spreadsheet.ExternalVariable.Volatile*">Volatile Method
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<div class="markdown level0 conceptual"></div>



<a id="GrapeCity_Spreadsheet_ExternalVariable_Volatile_" data-uid="GrapeCity.Spreadsheet.ExternalVariable.Volatile*"></a>
<h4 id="GrapeCity_Spreadsheet_ExternalVariable_Volatile_System_Boolean_" data-uid="GrapeCity.Spreadsheet.ExternalVariable.Volatile(System.Boolean)">Volatile(bool)</h4>
<div class="markdown level1 summary"><p>Marks this external variable as volatile. A volatile external variable must be recalculated whenever calculation occurs in any cells on the worksheet.
A nonvolatile external variable is recalculated only when the input variables change.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public void Volatile(bool @volatile)</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Sub Volatile(volatile As Boolean)</code></pre>
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<h5 class="parameters">Parameters</h5>
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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.boolean">bool</a></td>
      <td><span class="parametername">volatile</span></td>
      <td><p>if set to <code>true</code> this external variable is marked as volatile; otherwise, <code>false</code>.</p>
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    </tr>
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