static extern void OleCreatePropertyFrame(IntPtr hwndOwner, int x, int y,

    (ByVal hwndOwner As IntPtr, _

    static extern int OleCreatePropertyFrame(IntPtr hwndOwner,

static extern void OleCreatePropertyFrame(IntPtr hwndOwner, uint x, uint y,

    (ByVal hwndOwner As IntPtr, _

static extern int RegisterDragDrop(IntPtr hwnd, IDropTarget pDropTarget);

DRAGDROP_E_INVALIDHWND = ?;

static extern int RevokeDragDrop(IntPtr hwnd);

private static extern bool CeGetUserNotificationPreferences(IntPtr hWndParent, byte[] lpNotification);

private static extern bool CeGetUserNotificationPreferences(IntPtr hWndParent, byte[] lpNotification);

static extern int ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hwnd, int dwflags, IntPtr lParam);

Declare Function ChangeDisplaySettingsEx Lib "coredll.dll" (ByVal lpszDeviceName As String, ByVal lpDevMode As Byte(), ByVal hwnd As IntPtr, ByVal dwflags As CDSFlags, ByVal lParam As IntPtr) As CDSRet

        ref DEVMODE lpDevMode, IntPtr hwnd, int dwflags, IntPtr lParam);

    Friend Shared Function ChangeDisplaySettingsEx(ByVal lpszDeviceName As String, ByVal lpDevMode As Byte(), ByVal hwnd As IntPtr, ByVal dwflags As CDSFlags, ByVal lParam As IntPtr) As CDSRet

hwnd

in Specifies the scope of this function. Set to TGF_SCOPE_WINDOW to disable gestures for the window indicated by hwnd. Set to TGF_SCOPE_PROCESS to disable gestures for the application process.

    public static extern bool DisableGestures(IntPtr hwnd, UInt64 TGFflags, uint scope);

hwnd

in Specifies the scope of this function. Set to TGF_SCOPE_WINDOW to enable gestures for the window indicated by hwnd. Set to TGF_SCOPE_PROCESS to enable gestures for the application process.

public static extern bool EnableGestures(IntPtr hwnd, UInt64 TGFflags, uint scope);

private static extern IntPtr GetDC(IntPtr hwnd);

    private static extern IntPtr GetDC(IntPtr hwnd);

    public const int HWND_TOP = 0;

    public const int HWND_BOTTOM = 1;

    public const int HWND_TOPMOST = -1;

    public const int HWND_NOTOPMOST = -2;

private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);

Private Shared Function SetWindowPos(ByVal hWnd As IntPtr, _

     ByVal hWndInsertAfter As IntPtr, _

public IntPtr GetHWnd(Control ctrl)

   IntPtr hWnd = GetCapture();

   return hWnd;

    IntPtr hWnd = GetCapture();

    SetWindowPos(hWnd,

        hWnd,

static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X,

   public static extern int GetClassName(IntPtr hWnd, StringBuilder buf, int nMaxCount);

   (hWnd as IntPtr, buf As StringBuilder, nMaxCount As Integer) As Integer

   IntPtr hWnd = GetDesktopWindow();

   GetClassName(hWnd, strClassName, strClassName.Capacity);

private static extern IntPtr GetDCCE(IntPtr hWnd);

private static extern bool SetForegroundWindow(IntPtr hWnd);

private static extern IntPtr GetWindowDCCE(IntPtr hWnd);

Private Shared Function GetWindowDC(ByVal hWnd As HandleRef) As IntPtr

Declare Function GetWindowDC Lib "coredll.dll" (ByVal hWnd As HandleRef) As IntPtr

static extern System.UInt32 GetWindowLong(IntPtr  hWnd, int nIndex);

    Private Shared Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As System.UInt32

public static extern IntPtr ImmGetContext(IntPtr hWnd);

Declare Function ImmGetContext Lib "coredll.dll" (hWnd As IntPtr) As IntPtr

public static extern IntPtr ImmReleaseContext(IntPtr hWnd, IntPtr context);

        IntPtr hWnd= IntPtr.Zero;

        hWnd= GetActiveWindow();

        if(hWnd == IntPtr.Zero){

        context= ImmGetContext(hWnd);       //get IMEContext

            ImmReleaseContext(hWnd, context);   //Release IMEContext

public static extern int MessageBoxW(int hWnd, String text, String caption, uint type);

    Public Shared Function MessageBoxW(ByVal hWnd As Integer, _

        public IntPtr HWnd;

            notdata.HWnd = this.Hwnd;

private static extern bool OpenClipboard(IntPtr hWndNewOwner); !!!!VB Signature:

private static extern bool OpenClipboard(IntPtr hWndNewOwner);  

<DllImport("coredll.dll")> Shared Function OpenClipboard(ByVal hWndNewOwner As Integer) As Boolean

internal static extern bool PostKeybdMessage(IntPtr hwnd, uint vKey, KeyStateFlags flags, uint cCharacters, KeyStateFlags[] pShiftStateBuffer, uint[] pCharacterBuffer);

private static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

Declare Function SendMessage Lib "coredll.dll" (ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As IntPtr

    public static extern int SendMessage(IntPtr hWnd, WM Msg, int wParam, int lParam);

    public static extern int SendMessage(IntPtr hWnd, WM Msg, int wParam, int lParam);

static extern IntPtr SetCapture(IntPtr hWnd);

Declare Function SetCapture Lib "coredll.dll" (ByVal hWnd As IntPtr) As IntPtr

public IntPtr GetHWnd(Control ctrl)

   IntPtr hWnd = GetCapture();

   return hWnd;

    <DllImport("coredll.dll")> Shared Function OpenClipboard(ByVal hWndNewOwner As Integer) As Boolean

private static extern bool SetForegroundWindow (IntPtr hWnd);

Private Shared Function SetForegroundWindow(ByVal hWnd As IntPtr) As Boolean

Private Declare Function SetForegroundWindow Lib "coredll" (hWnd as IntPtr) As Boolean

E.g. SetForegroundWindow((HWND)(((ULONG) hwnd) | 0x01) );

private static extern bool SetForegroundWindow (IntPtr hWnd);

    static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);

    static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);

    static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);

private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

Private Shared Function SetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer

Private Shared Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As Integer

        IntPtr hWnd;

        // hWnd = GetCapture();

       hWnd = ctrl.Handle;

        style = GetWindowLong(hWnd, GWL_STYLE);

        SetWindowLong(hWnd, GWL_STYLE, (style | BS_CENTER | BS_VCENTER | BS_MULTILINE));

    Private Function SetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer

    Private Function GetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer) As Integer

    Dim hWnd As IntPtr

    hWnd = ctrl.Handle

    style = GetWindowLong(hWnd, GWL_STYLE)

    SetWindowLong(hWnd, GWL_STYLE, (style Or BS_VCENTER Or BS_MULTILINE))

private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);

Private Shared Function SetWindowPos(ByVal hWnd As IntPtr, _

     ByVal hWndInsertAfter As IntPtr, _

    public const int HWND_TOP = 0;

    public const int HWND_BOTTOM = 1;

    public const int HWND_TOPMOST = -1;

    public const int HWND_NOTOPMOST = -2;

    private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, SetWindowPosFlags uFlags);

    private const int HWND_TOP = 0;

    private const int HWND_BOTTOM = 1;

    private const int HWND_TOPMOST = -1;

    private const int HWND_NOTOPMOST = -2;

        /// top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter

        /// <summary>Retains the current Z order (ignores the hWndInsertAfter parameter).</summary>

        IntPtr hwnd = new WindowInteropHelper(this.window).Handle;

        SetWindowPos(hwnd, (IntPtr)HWND_BOTTOM, 0, 0, 0, 0,

    static extern int SHGetSpecialFolderPath(IntPtr hwndOwner, StringBuilder lpszPath, int nFolder, int fCreate);

static extern int SHGetSpecialFolderPath(IntPtr hwndOwner, StringBuilder lpszPath, int nFolder, int fCreate);

static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

Declare Function ShowWindow Lib "coredll.dll" (ByRef hWnd As IntPtr, ByVal nCmdShow As Integer) As Boolean

hWnd is a parameter containing the handle to the window.

static extern uint TrackPopupMenuEx(IntPtr hMenu, uint uFlags, int x, int y, IntPtr hWnd, IntPtr tpmParams);

    uint menuItemID = TrackPopupMenuEx(hMenu, TPM_BOTTOMALIGN | TPM_RETURNCMD, Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height, eventSink.Hwnd, IntPtr.Zero);

            IntPtr hwnd = IntPtr.Zero;

static extern int MsiSetInternalUI(int dwUILevel, ref IntPtr phWnd);

static extern int MsiSetInternalUI(INSTALLUILEVEL dwUILevel, ref IntPtr phWnd);

Private Function MsiSetInternalUI(dwUILevel As INSTALLUILEVEL, ByRef phWnd As IntPtr) As Integer

IntPtr hwnd = IntPtr.Zero;

MsiUtils.MsiSetInternalUI(MsiUtils.INSTALLUILEVEL.INSTALLUILEVEL_NONE , ref hwnd);

  uint error = MAPILogon(hwnd, null, null, MAPI_LOGON_UI, 0, ref session);

    Private Shared Function MAPISendMail(ByVal sess As IntPtr, ByVal hwnd As IntPtr, ByVal message As MapiMessage,

    static extern int MAPISendMail(IntPtr sess, IntPtr hwnd, MapiMessage message, int flg, int rsv);

      public IntPtr hwndParent;

    credui.hwndParent = this.Handle;

     public IntPtr hwndParent;

          IntPtr hWnd,    

public static extern IntPtr ImmGetContext(IntPtr hWnd);

    public static extern IntPtr ImmGetContext(IntPtr hwnd);

    public static extern int ImmSimulateHotKey(IntPtr hwnd, int lngHotkey);

public string[] GetReverseConversion(IntPtr AHwnd,string AText)

    IntPtr hIMC = ImmGetContext(AHwnd);

public static extern bool ImmReleaseContext(IntPtr hWnd,IntPtr hIMC);

    static extern System.UInt16  SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);

        static extern IntPtr GetDC(IntPtr hWnd);

        static extern IntPtr GetDC(IntPtr hWnd);

            Graphics graphics = Graphics.FromHwnd(IntPtr.Zero);

            Graphics graphics = Graphics.FromHwnd(IntPtr.Zero);

    Graphics vGraphics = Graphics.FromHwnd(Handle);

        static extern IntPtr GetDC(IntPtr hWnd);

static extern IntPtr GetDC(IntPtr hWnd);

Public Function GetDC(ByVal hwnd As IntPtr) As IntPtr

         (ByVal hWnd As Long) As Long

Use GetWindowDC(IntPtr hWnd); for taking the dc for the whole window since this function only gets the client area of the window.

Use IntPtr.Zero for hWnd to get a dc for the whole screen(Thanks to Mr.Charles Petzold.).

IntPtr dc = GetDC(hWnd);

        using (System.Drawing.Graphics g = System.Drawing.Graphics.FromHwnd(IntPtr.Zero))

        Using g As System.Drawing.Graphics = System.Drawing.Graphics.FromHwnd(IntPtr.Zero)

        Graphics g = Graphics.FromHwnd(IntPtr.Zero);

  static extern IntPtr GetDC(IntPtr hwnd);

  static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

      static extern IntPtr GetDC(IntPtr hwnd);

      static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

    private static IntPtr HWND_BROADCAST = new IntPtr(0xffff);

    private static IntPtr HWND_TOP = new IntPtr(0);

    private static IntPtr HWND_BOTTOM = new IntPtr(1);

    private static IntPtr HWND_TOPMOST = new IntPtr(-1);

    private static IntPtr HWND_NOTOPMOST = new IntPtr(-2);

    private static IntPtr HWND_MESSAGE = new IntPtr(-3);

    private static extern int SendMessage(IntPtr hWnd, WindowsMessages wMsg, IntPtr wParam, IntPtr lParam);

        long result = SendMessage(HWND_BROADCAST, WindowsMessages.WM_FONTCHANGE, IntPtr.Zero, IntPtr.Zero);