watin - Automate of file download in IE 11 using c# -

i trying window handler , press save button. found couple of examples on ie8 & 9. code doesn't works on ie 11.

    const int bm_click = 0x00f5;      [dllimport("user32.dll", setlasterror = true)]     static extern intptr findwindow(string lpclassname, string lpwindowname);      [dllimport("user32.dll")]     [return: marshalas(unmanagedtype.bool)]     static extern bool setforegroundwindow(intptr hwnd);      [dllimport("user32.dll", setlasterror = true)]     static extern intptr setactivewindow(intptr hwnd);      [dllimport("user32.dll", charset = charset.auto)]     public static extern intptr findwindowex(intptr parent, intptr next, string sclassname, intptr swindowtitle);      [dllimport("user32.dll", setlasterror = true)]     static extern intptr findwindowex(intptr hwndparent, intptr hwndchildafter, string lpszclass, string lpszwindow);      [dllimport("user32.dll", charset = charset.auto)]     static extern intptr sendmessage(intptr hwnd, uint32 msg, intptr wparam, intptr lparam);        [dllimport("user32.dll", exactspelling = true, charset = charset.auto)]     public static extern uint getdlgctrlid(intptr hwnd);       [dllimport("user32.dll", charset = charset.auto)]     public static extern intptr sendmessage(intptr hwnd, int msg, int wparam, intptr lparam);           //hdialog  - handle of dialog window. idbtn - id of button       public static bool clickbuttonondialog(intptr hdialog, uint32 idbtn)       {           intptr res = intptr.zero;           uint id;           intptr hokbtn = intptr.zero;           int attempt = 0;                     {               thread.sleep(300);               //searching button               hokbtn = findwindowex(hdialog, hokbtn, "button", intptr.zero);               id = getdlgctrlid(hokbtn);               attempt++;           } while (id != idbtn && attempt < 20);           if (!hokbtn.equals(intptr.zero))           {               //click button               res = sendmessage(hokbtn, (int)bm_click, 1, intptr.zero);           }           if (res.toint32() == 1)               return true;           return false;       }        public static void findandsave()       {           intptr hokbtn = intptr.zero;           uint message = 0xf5;            intptr hwnd = findwindow(null, "internet explorer");           hokbtn = findwindowex(hwnd, hokbtn, "button", "cancel");           sendmessage(hokbtn, (int)message, 1, intptr.zero); 

i able download , close file download dialog box using below code

[dllimport("user32.dll", setlasterror = true)]     static extern intptr findwindow(string lpclassname, string lpwindowname);        static void downloadfile(ie browser)     {         browser.link(find.bytext("download")).clicknowait();          thread.sleep(1000);         automationelementcollection dialogelements = automationelement.fromhandle(findwindow(null, "internet explorer")).findall(treescope.children, condition.truecondition);         foreach (automationelement element in dialogelements)         {             if (element.current.name.equals("save"))             {                 var invokepattern = element.getcurrentpattern(invokepattern.pattern) invokepattern;                 invokepattern.invoke();              }         }     }