# C1.Document.Parameter.AllowBlank

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<h1 id="C1_Document_Parameter_AllowBlank_" data-uid="C1.Document.Parameter.AllowBlank*">AllowBlank Property
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<a id="C1_Document_Parameter_AllowBlank_" data-uid="C1.Document.Parameter.AllowBlank*"></a>
<h4 id="C1_Document_Parameter_AllowBlank" data-uid="C1.Document.Parameter.AllowBlank">AllowBlank</h4>
<div class="markdown level1 summary"><p>Gets or sets a value indicating whether the value of this parameter can be an empty string.
Ignored unless <a class="xref" href="C1.Document.Parameter.DataType.html#C1_Document_Parameter_DataType">DataType</a> is <b>String</b>.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">[C1Category(&quot;Behavior&quot;)]
[C1Description(&quot;Parameter.AllowBlank&quot;, &quot;Indicates whether the parameter can be an empty string. Used only if the DataType of the parameter is String.&quot;)]
public bool AllowBlank { get; set; }</code></pre>
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  <pre><code class="lang-vbnet hljs">&lt;C1Category(&quot;Behavior&quot;)&gt;
&lt;C1Description(&quot;Parameter.AllowBlank&quot;, &quot;Indicates whether the parameter can be an empty string. Used only if the DataType of the parameter is String.&quot;)&gt;
Public Property AllowBlank As Boolean</code></pre>
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