# C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterVariable

## Content

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<h1 id="C1_CalcEngine_ExpressionEngine_IExpressionSyntax_RegisterVariable_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterVariable*">RegisterVariable Method
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<div class="markdown level0 conceptual"></div>



<a id="C1_CalcEngine_ExpressionEngine_IExpressionSyntax_RegisterVariable_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterVariable*"></a>
<h4 id="C1_CalcEngine_ExpressionEngine_IExpressionSyntax_RegisterVariable_System_String_System_Object_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionSyntax.RegisterVariable(System.String,System.Object)">RegisterVariable(string, object)</h4>
<div class="markdown level1 summary"><p>Registers a variable that can be evaluated by expression engine.</p>
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<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">void RegisterVariable(string key, object value)</code></pre>
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  <pre><code class="lang-vbnet hljs">Sub RegisterVariable(key As String, value As Object)</code></pre>
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<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-condensed">
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    <tr>
      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
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    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></td>
      <td><span class="parametername">key</span></td>
      <td><p>Variable key.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></td>
      <td><span class="parametername">value</span></td>
      <td><p>Variable value.</p>
</td>
    </tr>
  </tbody>
</table>
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