c# - I wanted to understand the purpose of this code snippet -

can please explain purpose of c# code. it's code snippet in windows based application. counting number of keypress? purpose of 13 here?

any appreciated

 private void num2_keypress(object sender, keypresseventargs e)     {       if ((int) e.keychar != 13)         return;       this.calculate();     } 

that code unfortunately written - keypresseventargs.keychar returns character pressed (so shift-a return 'a' example). 13 unicode character "carriage return" returned when user hits return. have written method as:

// possibly rename calculateifreturnispressed or similar. private void num2_keypress(object sender, keypresseventargs e) {     // perform calculation if user hit return     if (e.keychar == '\r')     {         calculate();     } } 

\r same character (char) 13.