# C1.Win.FlexGrid.Column.AllowNull

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<h1 id="C1_Win_FlexGrid_Column_AllowNull_" data-uid="C1.Win.FlexGrid.Column.AllowNull*">AllowNull Property
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<h4 id="C1_Win_FlexGrid_Column_AllowNull" data-uid="C1.Win.FlexGrid.Column.AllowNull">AllowNull</h4>
<div class="markdown level1 summary"><p>Gets or sets that cells in the <a class="xref" href="C1.Win.FlexGrid.Column.html">Column</a> will accept null value or null will be replaced by default value in unbound mode.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public bool AllowNull { get; set; }</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Property AllowNull As Boolean</code></pre>
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<h5 id="C1_Win_FlexGrid_Column_AllowNull_remarks">Remarks</h5>
<div class="markdown level1 remarks"><p>This property works only if <b>IsValueType</b> member of <a class="xref" href="C1.Win.FlexGrid.RowCol.DataType.html#C1_Win_FlexGrid_RowCol_DataType">DataType</a> property
equals to True and for type <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a>.
If value was changed to False then all null values in the <a class="xref" href="C1.Win.FlexGrid.Column.html">Column</a> will be
replaced by defaults of current <a class="xref" href="C1.Win.FlexGrid.RowCol.DataType.html#C1_Win_FlexGrid_RowCol_DataType">DataType</a>.</p>
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