# C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterFields

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<h1 id="C1_CalcEngine_ExpressionEngine_IExpressionSyntax_RegisterFields_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterFields*">RegisterFields Method
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<a id="C1_CalcEngine_ExpressionEngine_IExpressionSyntax_RegisterFields_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterFields*"></a>
<h4 id="C1_CalcEngine_ExpressionEngine_IExpressionSyntax_RegisterFields" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterFields">RegisterFields()</h4>
<div class="markdown level1 summary"><p>Registers the data source field names that can be evaluated by expression engine.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">void RegisterFields()</code></pre>
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  <pre><code class="lang-vbnet hljs">Sub RegisterFields()</code></pre>
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