C# Detect detect key down after button click -

i perform action after particular key pressed after button click. sth this: click button press end key , action performed.

i tried simple code doesn't work.

private void buttonstart_click(object sender, eventargs e)     {         keydown += onkeydown;              }      private void onkeydown(object sender, keyeventargs keyeventargs)     {         if (keyeventargs.keycode == keys.return)             label2.text = "siala";     } } 

you did not specify whether using winforms or wpf,
following example wpf should similar winforms well:

bool canclick = true;  public mainwindow() {     initializecomponent();     thebox.previewmousedown += thegrid_previewmousedown;           }  async void thegrid_previewmousedown(object sender, mousebuttoneventargs e) {                 if (canclick)     {         canclick = false;         thebox.previewkeydown += thegrid_previewkeydown;                         await task.delay(5000);         thebox.previewkeydown -= thegrid_previewkeydown;         canclick = true;     } }  void thegrid_previewkeydown(object sender, keyeventargs e) {     console.writeline("button {0}", e.key); } 

the idea here register event handler previewkeydown when
mouse clicked , remove handler after 5 seconds.

this way user have enter key within 5 seconds of clicking mouse.
boolean used make sure event handler isn't registered more once per time.

you should reactive extensions might provide cleaner
way of solving problem.