Catch KeyUp Event on WinForm C# -

i attempt catch f5 on system.windows.forms wrote:

partial class mainform {    (...)    this.keyup += new system.windows.forms.keyeventhandler(this.mainform_keyup);    (...) }  public partial class mainform : form {     (...)      private void mainform_keyup(object sender, keyeventargs e)     {         log("mainform_keyup");         if (e.keycode == keys.f5)         {             refreshstuff();         }     } } 

but event catching looks not working.

do know how cactch eventkey on system.windows.forms ?

the keypreview property of form must set true

when property set true, form receive keypress, keydown, , keyup events. after form's event handlers have completed processing keystroke, keystroke assigned control focus.