/// <summary>Don't call SetForegroundWindow() when activating the dialog.</summary>

         NativeWindow.SetForegroundWindow(this.Handle);

      /// Retrieves the number of times SetForegroundWindow will flash the taskbar button when rejecting a foreground switch request.

      /// Sets the number of times SetForegroundWindow will flash the taskbar button when rejecting a foreground switch request.

    /// To activate the window, use the SetActiveWindow or SetForegroundWindow function.

    ''' To activate the window, use the SetActiveWindow or SetForegroundWindow function.

static extern bool AllowSetForegroundWindow(int dwProcessId);

Shared Function AllowSetForegroundWindow(ByVal dwProcessId As Integer) As Boolean

AllowSetForegroundWindow(System.Diagnostics.Process.GetCurrentProcess().Id)

- The foreground is not locked (see LockSetForegroundWindow).

        // THE FOLLOWING METHOD REFERENCES THE SetForegroundWindow API

                return SetForegroundWindow((IntPtr)hWnd);

        public static extern int SetForegroundWindow( IntPtr Hwnd );

                SetForegroundWindow( Hwnd );

      private static extern bool SetForegroundWindow(IntPtr hWnd);

          SetForegroundWindow(hWnd);

Use FindWindow and SetForegroundWindow to direct input to the desired window.

  SetForegroundWindow (FindWindow('Untitled - Notepad'))

static extern bool LockSetForegroundWindow(uint uLockCode);

Public Shared Function LockSetForegroundWindow(uLockCode As UInteger) As <MarshalAs(UnmanagedType.Bool)> Boolean

- The SetForegroundWindow API

    ///     <item>The foreground is not locked (see LockSetForegroundWindow).</item>

    ///     calling the AllowSetForegroundWindow function. The process specified by dwProcessId loses the ability to set

    ///     the next time a process calls AllowSetForegroundWindow, unless that process is specified.

    ///     The foreground process can disable calls to SetForegroundWindow by calling the LockSetForegroundWindow

static extern bool SetForegroundWindow(IntPtr hWnd);

Private Shared Function SetForegroundWindow(ByVal hWnd As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean

Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As IntPtr) As Long

SetForegroundWindow Win32-API not always works on Windows-7 (vista and above).

https://shlomio.wordpress.com/2012/09/04/solved-setforegroundwindow-win32-api-not-always-works/

As mentioned above SetForegroundWindow might not always work as expected but it is actually very well documented why on https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-setforegroundwindow

So simply call keybd_event(0, 0, 0, 0); right in front of SetForegroundWindow(IntPtr hWnd);

MyWrapper.SetForegroundWindow(targetHWnd);

        SetForegroundWindow(hWnd);

                return SetForegroundWindow((IntPtr)hWnd);

http://jorgearimany.blogspot.com/2010/10/win32-setforegroundwindow-equivalent-in.html

- [SetForegroundWindow] on MSDN

    ///     SetForegroundWindow function.

    ///     SetForegroundWindow permission.

private static extern bool SetForegroundWindow(IntPtr hWnd);

    SetForegroundWindow (GetDesktopWindow());

If you are searching for a way to send keys to an application, you can use System.Windows.Forms.SendKeys.Send(keys) after bringing the window to the top via the SetForegroundWindow API.

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

http://www.pinvoke.net/default.aspx/user32/SetForegroundWindow.html

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

private static extern bool SetForegroundWindow (IntPtr hWnd);

    SetForegroundWindow (GetDesktopWindow ());

static extern void CoAllowSetForegroundWindow(