WinForm receive global shortcut keys

 Public classNativeWIN32 { PublicNativeWIN32 () {}/*-------using WIN32 Windows API in a C # application-------*/[DllImport ("user32.dll", CharSet =CharSet.Auto)]Static  Public externIntPtr GetForegroundWindow ();//[StructLayout (layoutkind.sequential, CharSet=CharSet.Auto)] Public structStringBuffer {[MarshalAs (UnmanagedType.ByValTStr, SizeConst= the)]             Public stringSztext; } [DllImport ("user32.dll", CharSet =CharSet.Auto)] Public Static extern intGetWindowText (IntPtr hWnd, outStringBuffer ClassName,intnMaxCount); [DllImport ("user32.dll", CharSet =CharSet.Auto)] Public Static extern intSendMessage (IntPtr hWnd,intMsgintWParam,intLParam); [DllImport ("user32.dll", CharSet =CharSet.Auto)] Public Static externIntPtr SendMessage (IntPtr hWnd,intMsgintWParam, IntPtr lParam);  Public Const intWm_syscommand =0x0112;  Public Const intSc_close =0xf060;  Public Delegate BOOLEnumthreadproc (IntPtr hwnd, INTPTR LParam); [DllImport ("user32.dll", CharSet =CharSet.Auto)] Public Static extern BOOLEnumThreadWindows (intthreadId, Enumthreadproc pfnenum, IntPtr lParam); [DllImport ("user32.dll", CharSet =CharSet.Auto)] Public Static externIntPtr FindWindowEx (IntPtr parent, IntPtr Next,stringSclassname, IntPtr swindowtitle); /*-------using Hotkeys in a C # application-------in form load:bool success = RegisterHotKey (Handle , Keymodifiers.control |         Keymodifiers.shift, KEYS.J);           In form Closing:unregisterhotkey (Handle, 100);              protected override void WndProc (ref Message m) {const int wm_hotkey = 0x0312;             Switch (m.msg) {case WM_HOTKEY:MessageBox.Show ("HOTKEY pressed");          Break } base.        WndProc (ref m); }-------using Hotkeys in a C # application-------*/[DllImport ("user32.dll", SetLastError =true)]         Public Static extern BOOLRegisterHotKey (IntPtr hWnd,//Handle to Window         intId//Hot Key IdentifierKeymodifiers Fsmodifiers,//key-modifier OptionsKeys VK//Virtual-key Code         ); [DllImport ("user32.dll", SetLastError =true)]         Public Static extern BOOLUnregisterhotkey (IntPtr hWnd,//Handle to Window         intId//Hot Key Identifier         ); [Flags ()] Public enumkeymodifiers {None=0, Alt=1, Control=2, Shift=4, Windows=8        }    }

Register the hotkey first in the Load event in form

        /// <summary>        ///Register Hotkey/// </summary>        /// <param name= "C" >Key</param>        /// <param name= "bCTRL" >do you need ctrl</param>        /// <param name= "Bshift" >Do you need shift</param>        /// <param name= "Balt" >Do you need alt</param>        /// <param name= "bwindows" >If you need win</param>         Public voidSetHotKey (Keys C,BOOLbCTRL,BOOLBshift,BOOLBalt,BOOLbwindows) {            //Assign to variables firstKeys M_key =C; BOOLM_ctrlhotkey =bCTRL; BOOLM_shifthotkey =Bshift; BOOLM_althotkey =Balt; BOOLM_winhotkey =bwindows; //Registration System HotkeyNativewin32.keymodifiers modifiers =NativeWIN32.KeyModifiers.None; if(bCTRL) modifiers|=NativeWIN32.KeyModifiers.Control; if(bshift) modifiers|=NativeWIN32.KeyModifiers.Shift; if(Balt) modifiers|=NativeWIN32.KeyModifiers.Alt; if(bwindows) Modifiers|=NativeWIN32.KeyModifiers.Windows; Nativewin32.registerhotkey (Handle, -, modifiers, c); }

Then listen for messages, handle events

        /// <summary>        ///overriding Windows message responses/// </summary>        /// <param name= "M" ></param>        protected Override voidWndProc (refMessage m) {            Const intWmhotkey =0x0312; Switch(m.msg) { CaseWmhotkey:windowmax ();  Break; }            Base. WndProc (refm); }