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Whether_need_to_unload_externally_before_loading_new_document #1639

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1 change: 1 addition & 0 deletions wpf-toc.html
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Expand Up @@ -1548,6 +1548,7 @@
<li><a href="/wpf/Pdf-Viewer/acquiring-current-page-being-displayed">Acquire current page being displayed</a></li>
<li><a href="/wpf/Pdf-Viewer/enabling-and-disabling-notification-bar">Enable and Disable Notification bar</a></li>
<li><a href="/wpf/Pdf-Viewer/how-to/Disable-the-Undo-Redo-operation">Disable the Undo Redo operation</a></li>
<li><a href="/wpf/Pdf-Viewer/how-to/Unload-the-document">Unload the document</a></li>
</ul>
</li>
</ul>
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36 changes: 36 additions & 0 deletions wpf/Pdf-Viewer/How-To/Unload-the-document.md
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---
layout: post
title: Unload the document in WPF Pdf Viewer | Syncfusion®
description: Learn how the Syncfusion® WPF PDF Viewer control automatically unloads the current document when loading a new one, eliminating the need for manual unloading.
platform: wpf
control: PDF Viewer
documentation: ug
---

# Unload the document in Pdf Viewer

The WPF PDF Viewer also allows a user to Unload the PDF document using [Unload()](https://help.syncfusion.com/cr/wpf/Syncfusion.Windows.PdfViewer.PdfViewerControl.html#Syncfusion_Windows_PdfViewer_PdfViewerControl_Unload) API of the [PdfViewerControl](https://help.syncfusion.com/cr/wpf/Syncfusion.Windows.PdfViewer.PdfViewerControl.html) and [PdfDocumentView](https://help.syncfusion.com/cr/wpf/Syncfusion.Windows.PdfViewer.PdfDocumentView.html) classes.
A user can dispose the PDF document by passing the Boolean parameter as ‘true’ to the [Unload(Boolean)](https://help.syncfusion.com/cr/wpf/Syncfusion.Windows.PdfViewer.PdfViewerControl.html#Syncfusion_Windows_PdfViewer_PdfViewerControl_Unload_System_Boolean_) API. The below code illustrates how to dispose the PDF document programmatically.

{% tabs %}
{% highlight c# %}

private void UnloadButton_Click(object sender, RoutedEventArgs e)
{
//Unload the PDF document
pdfviewer.Unload(true);
}

{% endhighlight %}
{% highlight VB %}

Private Sub UnloadButton_Click(sender As Object, e As RoutedEventArgs)
'Unload the PDF document
pdfviewer.Unload(true)
End Sub

{% endhighlight %}
{% endtabs %}

N>In PdfViewerControl, it is recommended not to unload the PDF document externally when loading a new PDF document, as the control internally handles the unloading process.