Drag & Drop in Treeview

This article is very helpful. Drag drop wpf

This code may be of use to you as well.

Point _startPoint;bool _IsDragging = false;void TemplateTreeView_PreviewMouseMove(object sender, MouseEventArgs e){    if (e.LeftButton == MouseButtonState.Pressed ||         e.RightButton == MouseButtonState.Pressed && !_IsDragging)    {        Point position = e.GetPosition(null);         if (Math.Abs(position.X - _startPoint.X) >                 SystemParameters.MinimumHorizontalDragDistance ||            Math.Abs(position.Y - _startPoint.Y) >                 SystemParameters.MinimumVerticalDragDistance)        {            StartDrag(e);        }    }           }void TemplateTreeView_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e){    _startPoint = e.GetPosition(null);}private void StartDrag(MouseEventArgs e){    _IsDragging = true;    object temp = this.TemplateTreeView.SelectedItem;    DataObject data = null;    data = new DataObject("inadt", temp);    if (data != null)    {        DragDropEffects dde = DragDropEffects.Move;        if (e.RightButton == MouseButtonState.Pressed)        {            dde = DragDropEffects.All;        }        DragDropEffects de = DragDrop.DoDragDrop(this.TemplateTreeView, data, dde);    }    _IsDragging = false;}