How should you complete the relevant code?

Explanation/Reference:
Explanation:
Example:
* At the top of the action that we created to handle the posted form, the one with the [HttpPost] attribute added, we’ll add another attribute named [ValidateAntiForgeryToken]. This makes the start of our action now look like the following:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult ChangeEmail(ChangeEmailModel model)
{
string username = WebSecurity.CurrentUserName;
*rest of function omitted*
* we must add the unique token to the form to change the user’s email when we display it. Update the form in the ChangeEmail.aspx view under / Account/ChangeForm:
<% using(Html.BeginForm()) { %>
<%: Html.AntiForgeryToken() %>
<%: Html.TextBoxFor(t=>t.NewEmail) %>
<input type="submit" value="Change Email" />
<% } %>