CodeTV.PanelChannel.treeViewChannel_MouseMove C# (CSharp) Method

        private void treeViewChannel_MouseMove(object sender, MouseEventArgs e)
        {
            if ((e.Button & MouseButtons.Left) == MouseButtons.Left)
            {
                // If the mouse moves outside the rectangle, start the drag.
                if (this.dragBoxFromMouseDown != Rectangle.Empty && !this.dragBoxFromMouseDown.Contains(e.X, e.Y))
                {
                    // Child element must be remove if any
                    foreach (TreeNode tnParent in new ArrayList(this.treeViewChannel.SelectedNodes))
                    {
                        if (tnParent.GetNodeCount(false) > 0)
                        {
                            foreach (TreeNode tnProbableChild in new ArrayList(this.treeViewChannel.SelectedNodes))
                            {
                                if (tnProbableChild != tnParent && tnProbableChild.FullPath.IndexOf(tnParent.FullPath) == 0)
                                    tnProbableChild.Checked = false;
                            }
                        }
                    }

                    // Proceed with the drag-and-drop, passing in the list item.
                    this.treeViewChannel.DoDragDrop(new ArrayList(this.treeViewChannel.SelectedNodes),
                        DragDropEffects.None | DragDropEffects.Copy | DragDropEffects.Move);
                }
            }
        }