pinvoke.net: Edit: Interfaces.IDropTargetHelper

@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$
@pinvoke=http://pinvoke.net/$$$.htm

Summary: COM interface, used for Shell themed Drag & Drop operations to your application window, for example like Windows Explorer does. Use it with IDragSourceHelper.

!!!!C# Definition:
...
    using drawing = System.Drawing;
    using IDataObject_Com = System.Runtime.InteropServices.ComTypes.IDataObject;
...
    [ComVisible(true), ComImport, Guid("4657278B-411B-11D2-839A-00C04FD918D0"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IDropTargetHelper {
        void DragEnter([In] IntPtr hwndTarget, [In, MarshalAs(UnmanagedType.Interface)] IDataObject_Com dataObject, [In] ref drawing.Point pt, [In] DragDropEffects effect);
        void DragLeave();
        void DragOver([In] ref drawing.Point pt, [In] DragDropEffects effect);
        void Drop([In, MarshalAs(UnmanagedType.Interface)] IDataObject_Com dataObject, [In] ref drawing.Point pt, [In] DragDropEffects effect);
        void Show([In] bool show);
    }
!!!!User-Defined Types:
None.

!!!!Notes:
Sample usage (in WPF):
	IDropTargetHelper dropHelper = Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("4657278A-411B-11D2-839A-00C04FD918D0"))) as IDropTargetHelper;

protected override void OnDragEnter(DragEventArgs e) {
	...
            var pointWpf = e.GetPosition(this);
            var point = new drawing.Point(Convert.ToInt32(pointWpf.X), Convert.ToInt32(pointWpf.Y));
            dropHelper.DragEnter(hWnd, e.Data as IDataObject_Com, ref point, e.Effects);
	...
	}

protected override void OnDragLeave(DragEventArgs e) {
	...
            dropHelper.DragLeave();
	...
        }

protected override void OnDragOver(DragEventArgs e) {
	...
            dropHelper.DragOver(ref point, e.Effects);
	...
        }

protected override void OnDrop(DragEventArgs e) {
	...
            var pointWpf = e.GetPosition(this);
            var point = new drawing.Point(Convert.ToInt32(pointWpf.X), Convert.ToInt32(pointWpf.Y));
            dropHelper.Drop(e.Data as IDataObject_Com, ref point, e.Effects);
	...         
        }

Documentation: IDropTargetHelper@msdn on MSDN