.NET Shell Extensions - Shell Drop Handlers

using System;
using System.ComponentModel;
using System.Linq;
using System.Runtime.InteropServices;
using SharpShell.Interop;
using SharpShell.SharpPropertySheet;

namespace SharpShell.Diagnostics
{
    public static class SharpPropertyPageTester
    {
        public static void Test(SharpPropertySheet.SharpPropertySheet sheet)
        {

            //  Create the bridge.
            var bridge = new NativeBridge.NativeBridge();
            bridge.Initialise();

            //  Create a property page proxy for this page.
            var proxy = new PropertyPageProxy(sheet, sheet.Pages.First());

            //  Using the proxy, create the property page handle.
            proxy.CreatePropertyPageHandle(bridge);
            var propertyPageHandle = proxy.HostWindowHandle;

            var psh = new PROPSHEETHEADER();
            psh.dwSize = Marshal.SizeOf(psh);
            psh.dwSize = 96;// (uint)Marshal.SizeOf(psh);
            //psh.dwFlags
            psh.hwndParent = IntPtr.Zero;
            psh.hInstance = bridge.GetInstanceHandle();
            psh.hIcon = IntPtr.Zero;
            psh.pszCaption = "Property Sheet";
            psh.nPages = 1;

            var pages = new []{ propertyPageHandle};
int nParts = pages.Length;
IntPtr pointer = Marshal.AllocHGlobal(nParts * Marshal.SizeOf(typeof(IntPtr)));
for (int i = 0; i < nParts; i++) {
    Marshal.WriteIntPtr(pointer, i * Marshal.SizeOf(typeof(IntPtr)), pages[i]);
}
            psh.phpage = pointer;
            psh.nStartPage = (IntPtr)0;
            try
            {
                var result = Comctl32.PropertySheet(ref psh);
            }
            catch (Exception)
            {
                var excep = new Win32Exception(Marshal.GetLastWin32Error());
                
                throw;
            }


            //  Release the bridge.
            bridge.Deinitialise();

        }
    }
}