# DDCssLib.CSSDeclaration.AppendUnknownValue

## Content

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<h1 id="DDCssLib_CSSDeclaration_AppendUnknownValue_" data-uid="DDCssLib.CSSDeclaration.AppendUnknownValue*">AppendUnknownValue Method
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<div class="markdown level0 conceptual"></div>



<a id="DDCssLib_CSSDeclaration_AppendUnknownValue_" data-uid="DDCssLib.CSSDeclaration.AppendUnknownValue*"></a>
<h4 id="DDCssLib_CSSDeclaration_AppendUnknownValue_System_String_System_String_" data-uid="DDCssLib.CSSDeclaration.AppendUnknownValue(System.String,System.String)">AppendUnknownValue(string, string)</h4>
<div class="markdown level1 summary"><p>Used to append unknown properties to this declaration.  The unknown name and value will be used only
when rebuilding the CSS string again.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public void AppendUnknownValue(string sPropertyName, string sPropertyValue)</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>
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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">sPropertyName</span></td>
      <td><p>The unchanged name of the CSS property parsed.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></td>
      <td><span class="parametername">sPropertyValue</span></td>
      <td><p>The unchanged value for the CSS property.</p>
</td>
    </tr>
  </tbody>
</table>
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