# C1.Win.FlexGrid.C1FlexGridBase.Invalidate

## Content

<div class="doc-site-dotnet-api-container">



<h1 id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate*">Invalidate Method
</h1>
<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate*"></a>
<h4 id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate">Invalidate()</h4>
<div class="markdown level1 summary"><p>Invalidates the control.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">public void Invalidate()</code></pre>
</div>
<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Sub Invalidate()</code></pre>
</div>


<a id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate*"></a>
<h4 id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_System_Int32_System_Int32_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate(System.Int32,System.Int32)">Invalidate(int, int)</h4>
<div class="markdown level1 summary"><p>Invalidates a cell, causing it to be repainted.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">public void Invalidate(int row, int col)</code></pre>
</div>
<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Sub Invalidate(row As Integer, col As Integer)</code></pre>
</div>
<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>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">row</span></td>
      <td><p>Row index.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">col</span></td>
      <td><p>Column index.</p>
</td>
    </tr>
  </tbody>
</table>
<h5 id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_System_Int32_System_Int32__remarks">Remarks</h5>
<div class="markdown level1 remarks"><p>This method is rarely used by the programmer, since the grid automatically performs invalidation as needed.</p>
</div>


<a id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate*"></a>
<h4 id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_System_Int32_System_Int32_System_Int32_System_Int32_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate(System.Int32,System.Int32,System.Int32,System.Int32)">Invalidate(int, int, int, int)</h4>
<div class="markdown level1 summary"><p>Invalidates a cell range, causing it to be repainted.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">public void Invalidate(int topRow, int leftCol, int bottomRow, int rightCol)</code></pre>
</div>
<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Sub Invalidate(topRow As Integer, leftCol As Integer, bottomRow As Integer, rightCol As Integer)</code></pre>
</div>
<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>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">topRow</span></td>
      <td><p>Top row in the range.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">leftCol</span></td>
      <td><p>Left column in the range.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">bottomRow</span></td>
      <td><p>Bottom row in the range.</p>
</td>
    </tr>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td><span class="parametername">rightCol</span></td>
      <td><p>Right column in the range.</p>
</td>
    </tr>
  </tbody>
</table>


<a id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate*"></a>
<h4 id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_C1_Win_FlexGrid_CellRange_" data-uid="C1.Win.FlexGrid.C1FlexGridBase.Invalidate(C1.Win.FlexGrid.CellRange)">Invalidate(CellRange)</h4>
<div class="markdown level1 summary"><p>Invalidates a cell range, causing it to be repainted.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
<div class="codewrapper">
  <pre><code class="lang-csharp hljs">public virtual void Invalidate(CellRange rg)</code></pre>
</div>
<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Overridable Sub Invalidate(rg As CellRange)</code></pre>
</div>
<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>
  <tbody>
    <tr>
      <td><a class="xref" href="C1.Win.FlexGrid.CellRange.html">CellRange</a></td>
      <td><span class="parametername">rg</span></td>
      <td><p><a class="xref" href="C1.Win.FlexGrid.CellRange.html">CellRange</a> that will be invalidated.</p>
</td>
    </tr>
  </tbody>
</table>
<h5 id="C1_Win_FlexGrid_C1FlexGridBase_Invalidate_C1_Win_FlexGrid_CellRange__remarks">Remarks</h5>
<div class="markdown level1 remarks"><p>This method is rarely used by the programmer, since the grid automatically
performs invalidation as needed.</p>
</div>
</div>