# C1.Maui.Calendar.ReentrantObservableCollection-1.BeginUpdate

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<h1 id="C1_Maui_Calendar_ReentrantObservableCollection_1_BeginUpdate_" data-uid="C1.Maui.Calendar.ReentrantObservableCollection`1.BeginUpdate*">BeginUpdate Method
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<a id="C1_Maui_Calendar_ReentrantObservableCollection_1_BeginUpdate_" data-uid="C1.Maui.Calendar.ReentrantObservableCollection`1.BeginUpdate*"></a>
<h4 id="C1_Maui_Calendar_ReentrantObservableCollection_1_BeginUpdate" data-uid="C1.Maui.Calendar.ReentrantObservableCollection`1.BeginUpdate">BeginUpdate()</h4>
<div class="markdown level1 summary"><p>Prevents raising events until the <a class="xref" href="C1.Maui.Calendar.ReentrantObservableCollection-1.EndUpdate.html#C1_Maui_Calendar_ReentrantObservableCollection_1_EndUpdate">EndUpdate()</a> method is called.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public void BeginUpdate()</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Sub BeginUpdate()</code></pre>
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<h5 id="C1_Maui_Calendar_ReentrantObservableCollection_1_BeginUpdate_remarks">Remarks</h5>
<div class="markdown level1 remarks"><p>The <a class="xref" href="C1.Maui.Calendar.ReentrantObservableCollection-1.html">ReentrantObservableCollection&lt;T&gt;</a> keeps count
of calls to <a class="xref" href="C1.Maui.Calendar.ReentrantObservableCollection-1.BeginUpdate.html#C1_Maui_Calendar_ReentrantObservableCollection_1_BeginUpdate">BeginUpdate()</a> method.
Be sure to call <a class="xref" href="C1.Maui.Calendar.ReentrantObservableCollection-1.EndUpdate.html#C1_Maui_Calendar_ReentrantObservableCollection_1_EndUpdate">EndUpdate()</a> method for each call to <a class="xref" href="C1.Maui.Calendar.ReentrantObservableCollection-1.BeginUpdate.html#C1_Maui_Calendar_ReentrantObservableCollection_1_BeginUpdate">BeginUpdate()</a> method.</p>
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