Asp.net membership change password without knowing old one

Further to csgero's answer, I found that you don't need to explicitly add an event handler for this event in ASP.Net 2.0 (3.5).

You can simply create the following method in global.asax and it gets wired up for you:

void Application_PostAuthenticateRequest(object sender, EventArgs e)
{
    if (this.User.Identity.IsAuthenticated)
    {
        // get user
        MembershipUser user = Membership.GetUser();

        // has their password expired?
        if (user != null
            && user.LastPasswordChangedDate.Date.AddDays(90) < DateTime.Now.Date
            && !Request.Path.EndsWith("/Account/ChangePassword.aspx"))
        {
            Server.Transfer("~/ChangePassword.aspx");
        }
    }
}

What I ended up doing was the following

public string ResetPassword(string email)
        {
            var m_userName = Membership.GetUserNameByEmail(email);
            var m_user = Membership.GetUser(m_userName);
            return m_user.ResetPassword();
        }

then I added a new method to use this value to change the password

public bool ChangeLostPassword(string email, string newPassword)
    {
        var resetPassword = ResetPassword(email);
        var currentUser = Membership.GetUser(Membership.GetUserNameByEmail(email), true);
        return currentUser.ChangePassword(resetPassword, newPassword);

    }