Which one of the following code snippets will you use to define an event handler for the click event of a button named bttnSubmit?

Which one of the following code snippets will you use to define an event handler for the click event of a button named bttnSubmit?

1. private int bttnSubmit_Click(object sender,
  RoutedEventArgs e)

2. private void bttnSubmit_Click(ClickEventArgs e,
  object sender)

3. private void bttnSubmit_Click(object sender,
  RoutedEventArgs e)

4. private int bttnSubmit_Click(ClickEventArgs, object
  sender)

Solution:

3. private void bttnSubmit_Click(object sender,
  RoutedEventArgs e)