# C1.Document.Parameter.Nullable

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<h1 id="C1_Document_Parameter_Nullable_" data-uid="C1.Document.Parameter.Nullable*">Nullable Property
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<a id="C1_Document_Parameter_Nullable_" data-uid="C1.Document.Parameter.Nullable*"></a>
<h4 id="C1_Document_Parameter_Nullable" data-uid="C1.Document.Parameter.Nullable">Nullable</h4>
<div class="markdown level1 summary"><p>Gets or sets a value indicating whether the value of this parameter can be null.
Cannot be true if this is a multi-value parameter.</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.Nullable&quot;, &quot;Indicates whether the parameter can be null. If true, the parameter will be optional in the UI prompting the user for parameter values.&quot;)]
public bool Nullable { get; set; }</code></pre>
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  <pre><code class="lang-vbnet hljs">&lt;C1Category(&quot;Behavior&quot;)&gt;
&lt;C1Description(&quot;Parameter.Nullable&quot;, &quot;Indicates whether the parameter can be null. If true, the parameter will be optional in the UI prompting the user for parameter values.&quot;)&gt;
Public Property Nullable As Boolean</code></pre>
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