# GrapeCity.Spreadsheet.SparklineDataSource.OnDirtied

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<h1 id="GrapeCity_Spreadsheet_SparklineDataSource_OnDirtied_" data-uid="GrapeCity.Spreadsheet.SparklineDataSource.OnDirtied*">OnDirtied Method
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<h4 id="GrapeCity_Spreadsheet_SparklineDataSource_OnDirtied" data-uid="GrapeCity.Spreadsheet.SparklineDataSource.OnDirtied">OnDirtied()</h4>
<div class="markdown level1 summary"><p>Designates this external variable to be recalculated when the next recalculation occurs.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">protected override void OnDirtied()</code></pre>
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  <pre><code class="lang-vbnet hljs">Protected Overrides Sub OnDirtied()</code></pre>
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<h5 class="overrides">Overrides</h5>
<div><span class="xref">GrapeCity.Spreadsheet.Data.CellRangeDataSource&lt;double&gt;.OnDirtied()</span></div>
<h5 id="GrapeCity_Spreadsheet_SparklineDataSource_OnDirtied_remarks">Remarks</h5>
<div class="markdown level1 remarks"><p>Accessing calculation engine (like get value of external variable) is available inside this function.</p>
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