# C1.Web.Mvc.Fluent.MultiSelectBuilder-1.HeaderFormatter

## Content

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<h1 id="C1_Web_Mvc_Fluent_MultiSelectBuilder_1_HeaderFormatter_" data-uid="C1.Web.Mvc.Fluent.MultiSelectBuilder`1.HeaderFormatter*">HeaderFormatter Method
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<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="C1_Web_Mvc_Fluent_MultiSelectBuilder_1_HeaderFormatter_" data-uid="C1.Web.Mvc.Fluent.MultiSelectBuilder`1.HeaderFormatter*"></a>
<h4 id="C1_Web_Mvc_Fluent_MultiSelectBuilder_1_HeaderFormatter_System_String_" data-uid="C1.Web.Mvc.Fluent.MultiSelectBuilder`1.HeaderFormatter(System.String)">HeaderFormatter(string)</h4>
<div class="markdown level1 summary"><p>Configurates <a class="xref" href="C1.Web.Mvc.MultiSelect-1.HeaderFormatter.html#C1_Web_Mvc_MultiSelect_1_HeaderFormatter">HeaderFormatter</a>.
Sets a function that gets the HTML in the control header.</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">public MultiSelectBuilder&lt;T&gt; HeaderFormatter(string value)</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Function HeaderFormatter(value As String) As MultiSelectBuilder(Of T)</code></pre>
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<h5 class="parameters">Parameters</h5>
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    <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">value</span></td>
      <td><p>The value.</p>
</td>
    </tr>
  </tbody>
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<h5 class="returns">Returns</h5>
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  <thead>
    <tr>
      <th>Type</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="C1.Web.Mvc.Fluent.MultiSelectBuilder-1.html">MultiSelectBuilder</a>&lt;T&gt;</td>
      <td><p>Current builder.</p>
</td>
    </tr>
  </tbody>
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<h5 id="C1_Web_Mvc_Fluent_MultiSelectBuilder_1_HeaderFormatter_System_String__remarks">Remarks</h5>
<div class="markdown level1 remarks"><p>By default, the control header content is determined based on the Placeholder, MaxHeaderItems, and on the current selection. You may customize the header content by specifying a function that returns a custom string based on whatever criteria your application requires.</p>
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