# C1.Framework.ListBoxElement.UpdateSelectAllCheckState

## Content

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<h1 id="C1_Framework_ListBoxElement_UpdateSelectAllCheckState_" data-uid="C1.Framework.ListBoxElement.UpdateSelectAllCheckState*">UpdateSelectAllCheckState Method
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<a id="C1_Framework_ListBoxElement_UpdateSelectAllCheckState_" data-uid="C1.Framework.ListBoxElement.UpdateSelectAllCheckState*"></a>
<h4 id="C1_Framework_ListBoxElement_UpdateSelectAllCheckState" data-uid="C1.Framework.ListBoxElement.UpdateSelectAllCheckState">UpdateSelectAllCheckState()</h4>
<div class="markdown level1 summary"><p>Updates &quot;Select All&quot; checkbox checkstate according with list items checkstates.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public virtual void UpdateSelectAllCheckState()</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Overridable Sub UpdateSelectAllCheckState()</code></pre>
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