private void KeyboardRecorder(object sender, RawKeyEventArgs args)
 {
     keyboard_textbox.Text += args.ToString();
 }
 void KListener_KeyDown(object sender, RawKeyEventArgs args)
 {
     Console.WriteLine(args.Key.ToString());
     Console.WriteLine(args.ToString());     // Prints the text of pressed button, takes in account big and small letters. E.g. "Shift+a" => "A"
 }