C1TreeView supports drag-and-drop behavior. For more information see the Drag-and-Drop Nodes topic. To enable drag-and-drop behavior, set the C1TreeView.AllowDragDrop property to True:
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C1TreeView.AllowDragDrop = True
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C1TreeView.AllowDragDrop = true;
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To enable visual drag-and-drop indicators you can set the C1TreeView.DragDropArrowMarker and C1TreeView.DragDropLineMarker properties.