# C1.WPF.DataFilter.C1DataFilter.SaveFilterExpression

## Content

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<h1 id="C1_WPF_DataFilter_C1DataFilter_SaveFilterExpression_" data-uid="C1.WPF.DataFilter.C1DataFilter.SaveFilterExpression*">SaveFilterExpression Method
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<div class="markdown level0 conceptual"></div>



<a id="C1_WPF_DataFilter_C1DataFilter_SaveFilterExpression_" data-uid="C1.WPF.DataFilter.C1DataFilter.SaveFilterExpression*"></a>
<h4 id="C1_WPF_DataFilter_C1DataFilter_SaveFilterExpression_System_String_" data-uid="C1.WPF.DataFilter.C1DataFilter.SaveFilterExpression(System.String)">SaveFilterExpression(string)</h4>
<div class="markdown level1 summary"><p>Saves expressions from the <a class="xref" href="C1.WPF.DataFilter.C1DataFilter.Filters.html#C1_WPF_DataFilter_C1DataFilter_Filters">Filters</a> collection to a file.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public void SaveFilterExpression(string fileName)</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Sub SaveFilterExpression(fileName As String)</code></pre>
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<h5 class="parameters">Parameters</h5>
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      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></td>
      <td><span class="parametername">fileName</span></td>
      <td><p>The file name for storing filter expressions.</p>
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    </tr>
  </tbody>
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<h5 class="exceptions">Exceptions</h5>
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  <thead>
    <tr>
      <th>Type</th>
      <th>Condition</th>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.invalidoperationexception">InvalidOperationException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.argumentexception">ArgumentException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.notsupportedexception">NotSupportedException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.argumentnullexception">ArgumentNullException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.security.securityexception">SecurityException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.io.filenotfoundexception">FileNotFoundException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.unauthorizedaccessexception">UnauthorizedAccessException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.io.ioexception">IOException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.io.directorynotfoundexception">DirectoryNotFoundException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.io.pathtoolongexception">PathTooLongException</a></td>
      <td></td>
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      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception">ArgumentOutOfRangeException</a></td>
      <td></td>
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