How to restrict dropping of a dragged TreeViewItemAdv over a target TreeViewItemAdv?

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DragEnd

DragEnd event alerts user when the dragged TreeViewItemAdv is about to drop over a target. The event arguments are TargetDropItem and AllowDragDrop.

TargetDropItem

It holds the instance of target drop TreeViewItemAdv.

AllowDragDrop

Indicates whether the drop operation has to be allowed or not.

The following code example shows how to restrict dropping over a TreeViewItemAdv using DropEnd event and its arguments. This allows drop operation only on the first level items of TreeViewAdv.

XAML

<syncfusion:TreeViewAdv DragEnd="TreeViewAdv_DragEnd"  >
            <syncfusion:TreeViewItemAdv Header="Item 1">
                <syncfusion:TreeViewItemAdv Header="Item 1.1"/>
                <syncfusion:TreeViewItemAdv Header="Item 1.2"/>
            </syncfusion:TreeViewItemAdv>
            <syncfusion:TreeViewItemAdv Header="Item 2">
                <syncfusion:TreeViewItemAdv Header="Item 2.1">
                    <syncfusion:TreeViewItemAdv Header="Item 2.1.1"/>
                    <syncfusion:TreeViewItemAdv Header="Item 2.1.2"/>
                </syncfusion:TreeViewItemAdv>
                <syncfusion:TreeViewItemAdv Header="Item 2.2"/>
            </syncfusion:TreeViewItemAdv>
            <syncfusion:TreeViewItemAdv Header="Item 2"/>
            <syncfusion:TreeViewItemAdv Header="Item 3"/>            
        </syncfusion:TreeViewAdv>

private void TreeViewAdv_DragEnd(object sender, Syncfusion.Windows.Tools.Controls.DragTreeViewItemAdvEventArgs e)
        {
            if (e.TargetDropItem is TreeViewItemAdv && (e.TargetDropItem as TreeViewItemAdv).ParentItemsControl != null && ((e.TargetDropItem as TreeViewItemAdv).ParentItemsControl is TreeViewItemAdv))
            {
                e.AllowDragDrop = false;
            }
        }

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How to restrict dropping of a dragged TreeViewItemAdv over a target TreeViewItemAdv?

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