C# WinForm ShowInTaskbar Api Version

 using System;
 using System.Runtime.InteropServices;

 namespace x
 {
     unsafe class NativeWindow
     {
         /*
          * Window field offsets for GetWindowLong()
          */
         public const int GWL_WNDPROC = (-);
         public const int GWL_HINSTANCE = (-);
         public const int GWL_HWNDPARENT = (-);
         public const int GWL_STYLE = (-);
         public const int GWL_EXSTYLE = (-);
         public const int GWL_USERDATA = (-);
         public const int GWL_ID = (-);

         public const int GWLP_WNDPROC = (-);
         public const int GWLP_HINSTANCE = (-);
         public const int GWLP_HWNDPARENT = (-);
         public const int GWLP_USERDATA = (-);
         public const int GWLP_ID = (-);

         /*
          * ShowWindow() Commands
          */
         public const int SW_HIDE = ;
         public const int SW_SHOWNORMAL = ;
         public const int SW_NORMAL = ;
         public const int SW_SHOWMINIMIZED = ;
         public const int SW_SHOWMAXIMIZED = ;
         public const int SW_MAXIMIZE = ;
         public const int SW_SHOWNOACTIVATE = ;
         public const int SW_SHOW = ;
         public const int SW_MINIMIZE = ;
         public const int SW_SHOWMINNOACTIVE = ;
         public const int SW_SHOWNA = ;
         public const int SW_RESTORE = ;
         public const int SW_SHOWDEFAULT = ;
         public const int SW_FORCEMINIMIZE = ;
         public const int SW_MAX = ;

         [DllImport("user32.dll")]
         public static extern IntPtr GetTaskmanWindow();

         [DllImport("user32.dll")]
         public static extern IntPtr SendMessageA(
           [In] IntPtr   hWnd,
           [In] int   Msg,
           [In] IntPtr wParam,
           [In] IntPtr lParam
         );

         [DllImport("user32.dll")]
         public static extern int SetWindowLongA(
           [In] IntPtr hWnd,
           [In] int nIndex,
           [In] int dwNewLong
         );

         [DllImport("user32.dll")]
         public static extern IntPtr SetWindowLongPtrA(
           [In] IntPtr hWnd,
           [In] int nIndex,
           [In] IntPtr dwNewLong
         );

         [DllImport("user32.dll")]
         public static extern bool ShowWindow(
           [In] IntPtr hWnd,
           [In] int nCmdShow
         );

         private IntPtr _hWnd;
         private bool _bShowInTaskbar;

         public bool ShowInTaskbar
         {
             get { return _bShowInTaskbar; }

             set
             {
                 if (value)
                 {
                     SetWindowLongCore(_hWnd, GWLP_HWNDPARENT, GetTaskmanWindow());
                 }
                 else
                 {
                     SetWindowLongCore(_hWnd, GWLP_HWNDPARENT, (IntPtr));
                 }
                 SendMessageA(hwndroot, WM_SETREDRAW, (IntPtr), (IntPtr));
                 ShowWindow(hwndroot, SW_HIDE);
                 ShowWindow(hwndroot, SW_SHOW);
                 SendMessageA(hwndroot, WM_SETREDRAW, (IntPtr), (IntPtr));
                 _bShowInTaskbar = value;
             }
         }

         public NativeWindow() { }

         public static IntPtr SetWindowLongCore(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
         {
             if (sizeof(void*) == )
             {
                 return (IntPtr)SetWindowLongA(hWnd, nIndex, (int)dwNewLong);
             }
             return SetWindowLongPtrA(hWnd, nIndex, dwNewLong);
         }

     }
 }