# C1.Xamarin.Forms.Gauge.C1BulletGraph.OnPropertyChanged

## Content

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



<h1 id="C1_Xamarin_Forms_Gauge_C1BulletGraph_OnPropertyChanged_" data-uid="C1.Xamarin.Forms.Gauge.C1BulletGraph.OnPropertyChanged*">OnPropertyChanged Method
</h1>
<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="C1_Xamarin_Forms_Gauge_C1BulletGraph_OnPropertyChanged_" data-uid="C1.Xamarin.Forms.Gauge.C1BulletGraph.OnPropertyChanged*"></a>
<h4 id="C1_Xamarin_Forms_Gauge_C1BulletGraph_OnPropertyChanged_System_String_System_Object_System_Object_System_Boolean_" data-uid="C1.Xamarin.Forms.Gauge.C1BulletGraph.OnPropertyChanged(System.String,System.Object,System.Object,System.Boolean)">OnPropertyChanged(string, object, object, bool)</h4>
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<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">protected override void OnPropertyChanged(string propertyName, object oldValue, object newValue, bool needRefresh)</code></pre>
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<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="https://learn.microsoft.com/dotnet/api/system.string">string</a></td>
      <td><span class="parametername">propertyName</span></td>
      <td></td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></td>
      <td><span class="parametername">oldValue</span></td>
      <td></td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></td>
      <td><span class="parametername">newValue</span></td>
      <td></td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a></td>
      <td><span class="parametername">needRefresh</span></td>
      <td></td>
    </tr>
  </tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="C1.Xamarin.Forms.Gauge.C1Gauge.OnPropertyChanged.html#C1_Xamarin_Forms_Gauge_C1Gauge_OnPropertyChanged_System_String_System_Object_System_Object_System_Boolean_">C1Gauge.OnPropertyChanged(string, object, object, bool)</a></div>
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