c# - SendKeys.Send function not working -

i want press shift + tab on event , using system.windows.forms.sendkeys.send purpose not working , tried below ways call function.

 system.windows.forms.application.doevents();                 sendkeys.send("{+(tab)}");   system.windows.forms.application.doevents();                 sendkeys.send("+{tab}");   system.windows.forms.application.doevents();                 sendkeys.send("{+}{tab}");   system.windows.forms.application.doevents();                 sendkeys.send("+{tab 1}"); 

can tell me right way ?

the proper syntax is:

sendkeys.send("+{tab}"); 

in light of comment trying implement pressing shift+tab cycle between control fields, note can done more reliably without emulating keys. avoids issues where, instance, window has focus.

following method emulate behavior of shift_tab, cycling through tab stops in reverse order:

void emulateshifttab() {     // form elements can focused     var tabcontrols = this.controls.cast<control>()             .where(a => a.canfocus)             .orderby(a => a.tabindex);      // last control before current focused element     var lastcontrol =             tabcontrols             .takewhile(a => !a.focused)             .lastordefault(a => a.tabstop);      // if no control or first control on page focused,     // select last control on page      if (lastcontrol == null)            lastcontrol = tabcontrols.lastordefault();      // change focus proper control     if (lastcontrol != null)            lastcontrol.focus(); } 

edit

the deleted text cycle through controls in reverse order (emulating shift+tab), more done with built-in form.selectnextcontrol method. following method emulate behavior of shift_tab, cycling through tab stops in reverse order.

void emulateshifttab() {     this.selectnextcontrol(         activecontrol,         forward: false,         tabstoponly:true,          nested: true,          wrap:true); }