How to SHIELD software from system hotkeys in B/S mode (C #)

Sometimes JavaScript code cannot be used when using a framework webpage. I have encountered this situation, but I have to block some key values, so I only need to write code in C, you can add some key values as needed! Public void hideallfunction (page)

{

If (! Page. isstartupscriptregistered ("msghideallfunction "))

{

String clientscript = @ "<script language = JavaScript> 〉

　　

Function keydown (){

If (window. event. altkey) & (window. event. keycode = 37) | (window. event. keycode = 39) // mask Alt + direction keys ↓ // mask Alt + direction keys →

{

　　

Event. returnvalue = false ;;

}

If (event. keycode = 116) // block the F5 refresh key

{

Event. keycode = 0 ;;

Event. returnvalue = false ;;

}

If (event. ctrlkey) & (event. keycode = 78) // block Ctrl + n

{

Event. returnvalue = false ;;

}

If (event. shiftkey) & (event. keycode = 121) // block SHIFT + F10

{

　　

Event. returnvalue = false ;;

}

If (event. keycode = 122) // block F11

{

Event. keycode = 0 ;;

Event. returnvalue = false ;;

}

}

Function nocontextmenu ()

{

Event. cancelbubble = true

Event. returnvalue = false ;;

Return false ;;

}

Document. onkeydown = keydown ;;

Document. oncontextmenu = nocontextmenu ;;

　　

　　

　　

</SCRIPT> 〉";;

Page. registerstartupscript ("msghideallfunction", clientscript );;

}