Drag n Drop in .net Treeview

I am using .net tree view control in my windows application. I have implemented the drag drop functionality which is working fine. Now, I want to show the text/custom image of the node that is being drag and its image much like we see 开发者_JAVA百科when we drag the folder on windows i.e. we see fade image of folder follows the cursor till drop happen.

How to do this in .net winform app.

Thanks, Omky

---

Here's a link to first of several articles that explains how.
http://blogs.msdn.com/b/adamroot/archive/2008/02/19/shell-style-drag-and-drop-in-net-wpf-and-winforms.aspx

Below is a bare minimum to get drag effect to work.

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using ComIDataObject = System.Runtime.InteropServices.ComTypes.IDataObject;

public static class DragDropEngine
{
      public static void ProcessDragEnter(DragEventArgs e)
      {
            Point point = Cursor.Position;
            WindowsPoint winpoint;
            winpoint.X = point.X;
            winpoint.Y = point.Y;
            IDropTargetHelper dropHelper = (IDropTargetHelper)new DragDropHelper();
            dropHelper.DragEnter(IntPtr.Zero, (ComIDataObject)e.Data, 
                  ref winpoint, (int)e.Effect);
      }
      public static void ProcessDragDrop(DragEventArgs e)
      {
            Point point = Cursor.Position;
            WindowsPoint winpoint;
            winpoint.X = point.X;
            winpoint.Y = point.Y;
            IDropTargetHelper dropHelper = (IDropTargetHelper)new DragDropHelper();
            dropHelper.Drop((ComIDataObject)e.Data, ref winpoint, (int)e.Effect);
      }
      public static void ProcessDragOver(DragEventArgs e)
      {
            Point point = Cursor.Position;
            WindowsPoint winpoint;
            winpoint.X = point.X;
            winpoint.Y = point.Y;
            IDropTargetHelper dropHelper = (IDropTargetHelper)new DragDropHelper();
            dropHelper.DragOver(ref winpoint, (int)e.Effect);
      }
      public static void ProcessDragLeave(EventArgs e)
      {
            IDropTargetHelper dropHelper = (IDropTargetHelper)new DragDropHelper();
            dropHelper.DragLeave();
      }
}
[ComImport]
[Guid("4657278A-411B-11d2-839A-00C04FD918D0")]
public class DragDropHelper
{
}
[ComVisible(true)]
[ComImport]
[Guid("4657278B-411B-11D2-839A-00C04FD918D0")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IDropTargetHelper
{
      void DragEnter(
          [In] IntPtr hwndTarget,
          [In, MarshalAs(UnmanagedType.Interface)] 
            System.Runtime.InteropServices.ComTypes.IDataObject dataObject,
          [In] ref WindowsPoint pt,
          [In] int effect);
      void DragLeave();
      void DragOver(
          [In] ref WindowsPoint pt,
          [In] int effect);
      void Drop(
          [In, MarshalAs(UnmanagedType.Interface)] 
            System.Runtime.InteropServices.ComTypes.IDataObject dataObject,
          [In] ref WindowsPoint pt,
          [In] int effect);
      void Show(
          [In] bool show);
}
[StructLayout(LayoutKind.Sequential)]
public struct WindowsPoint
{
      public int X;
      public int Y;
}