//
// ... some code that processes the password reset request.
//

var token = new UserUrlToken()
{
    UserId = USER_ID
};

var url = new QueryStringUrlTokenUrlProvider<TestIdUrlToken>()
{
    QueryStringKey = "token",
    Url = new Uri("URL_TO_PASSWORD_RESET_PAGE")
}.UrlFromToken(token);

//
// ... some code that places "url" into the body of the email.
//