</ iframe > </noscript> <!-- End Google Tag Manager (noscript) --> <div id="BeforeHeaderContent"> </div> <div id="HeaderContent"> <div id="ProjectTitle">Basic Library for UWP</div> <div id="PageTitle"><div id="PageTitleText">SelectionChanging Event</div></div> </div> <div id="AfterHeaderContent"> <!-- Spacing --> <span id="ToggleAllSectionsLink" class="FunctionLink"> <label id="CollapseAllLabel">Collapse All</label> <label id="ExpandAllLabel" style="display: none;">Expand All</label> </span><!-- Spacing --> <span id="LanguageFilterPopupLink" class="PopupLink" data-popupcontentsource="#LanguageCheckboxes" data-popuptitle='Language Filter'> <label id="ShowAllLabel" for="LanguageFilterPopupLink"> Language Filter: All </label> <label id="MultipleLabel" for="LanguageFilterPopupLink" style="display: none;"> Language Filter: Multiple </label> <label id="VBAllLabel" for="LanguageFilterPopupLink" style="display: none;"> Language Filter: Visual Basic </label> <label id="VBLabel" for="LanguageFilterPopupLink" style="display: none;">Language Filter: Visual Basic (Declaration)</label> <label id="CSLabel" for="LanguageFilterPopupLink" style="display: none;">Language Filter: C#</label> </span> <div class="PopupContent" id="LanguageCheckboxes"> <input data-languagename="VB" id="VBLanguageCheckbox" type="checkbox" class="ToggleLanguageCheckbox" checked="true" data-toggleclass="FilteredContentVB"> <label class="LanguageFilter" for="VBCheckbox"> Visual Basic (Declaration) </label> <br><input data-languagename="CS" id="CSLanguageCheckbox" type="checkbox" class="ToggleLanguageCheckbox" checked="true" data-toggleclass="FilteredContentCS"> <label class="LanguageFilter" for="CSCheckbox"> C# </label> </div> </div> <div class="BreadcrumbsContainer"><table><tr><td> <a href="C1.UWP.html">C1.UWP Assembly</a> > <a href="C1.UWP~C1.Xaml_namespace.html">C1.Xaml Namespace</a> > <a href="C1.UWP~C1.Xaml.C1TreeView.html">C1TreeView Class</a> : SelectionChanging Event</td></tr></table></div> <div id="BodyContent"> <div class="DescriptionContent">Occurs when the current selection begin to change.</div> <div class="SectionHeading" id="syntaxSectionHeading"><span class="SectionHeadingIcon"><!-- --></span><span class="SectionHeadingText">Syntax</span></div><div id="syntaxSectionContent" class="SectionContent"> <div class="TabContainer" id="TabContainer"> <ul> <li class="FilteredContentVBAll"><a href="#Syntax-VBAll">Visual Basic</a></li> <li class="FilteredContentCS"><a href="#Syntax-CS">C#</a></li> </ul> <div id="Syntax-VB" class="FilteredContentVB"> <pre>'Declaration Public Event SelectionChanging As <a href="C1.UWP~C1.Xaml.SelectionChangingEventHandler.html">SelectionChangingEventHandler</a></pre> </div> <div id="Syntax-CS" class="FilteredContentCS"> <pre>public event <a href="C1.UWP~C1.Xaml.SelectionChangingEventHandler.html">SelectionChangingEventHandler</a> SelectionChanging</pre> </div> </div> </div> <div class="SectionHeading" id="exceptionsSectionHeading"><span class="SectionHeadingIcon"><!-- --></span><span class="SectionHeadingText">Event Data</span></div><div id="exceptionsSectionContent" class="SectionContent"><p>The event handler receives an argument of type <a href="C1.UWP~C1.Xaml.SelectionChangingEventArgs.html">SelectionChangingEventArgs</a> containing data related to this event. The following <b>SelectionChangingEventArgs</b> properties provide information specific to this event.</p><table class="FilteredItemListTable"><tr><th>Property</th><th>Description</th></tr><tr><td class="LinkCell"><a href="C1.UWP~C1.Xaml.SelectionChangingEventArgs~AddedItems.html">AddedItems</a></td><td class="DescriptionCell"> (Inherited from Windows.UI.Xaml.Controls.SelectionChangedEventArgs)</td></tr><tr><td class="LinkCell"><a href="C1.UWP~C1.Xaml.SelectionChangingEventArgs~Cancel.html">Cancel</a></td><td class="DescriptionCell">Cancel the Selection operation. </td></tr><tr><td class="LinkCell"><a href="C1.UWP~C1.Xaml.SelectionChangingEventArgs~OriginalSource.html">OriginalSource</a></td><td class="DescriptionCell"> (Inherited from Windows.UI.Xaml.RoutedEventArgs)</td></tr><tr><td class="LinkCell"><a href="C1.UWP~C1.Xaml.SelectionChangingEventArgs~RemovedItems.html">RemovedItems</a></td><td class="DescriptionCell"> (Inherited from Windows.UI.Xaml.Controls.SelectionChangedEventArgs)</td></tr></table></div> <a name="exampleBookmark"></a> <a name="seealsobookmark"></a> <div class="SectionHeading" id="seealsoSectionHeading"><span class="SectionHeadingIcon"><!-- --></span><span class="SectionHeadingText">See Also</span></div><div id="seealsoSectionContent" class="SectionContent"><h4 class="subHeading">Reference</h4><p><a href="C1.UWP~C1.Xaml.C1TreeView.html">C1TreeView Class</a> <br><a href="C1.UWP~C1.Xaml.C1TreeView_members.html">C1TreeView Members</a> </p> </div> </div> <div id="FooterContent"> <p> </p><p> </p><hr style="height: 1px"><p>Copyright (c) <script type="text/javascript"> var theDate=new Date() document.write(theDate.getFullYear()) </script> GrapeCity, inc. 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