Manual Reset Users Password

I currently have a site where I administer users and their account.  On my Admin dashboard I want to be able to reset their user's password to whatever I type without knowing the users current password.  Below is my coding, I want to either be able to get the user's current password and then change it to whatever I enter in the tb_PWOverride textbox or if that isn't possible I want to reset their password, and get the hashed password and change it to whatever I type in the tb_PWOverride textbox.

the textbox's tb_SecQuest, and tb_SecAns are text boxs I am using to update the security question and answer.  That part of the procedure is at least working right now.

        protected void btn_profile_Update_Click(object sender, EventArgs args)
        {
            try
            {

                MembershipUser u = Membership.GetUser(ddl_AllUsers.SelectedValue);
                //string tempPswd = u.ResetPassword(); ------I would use this line only if I reset
                string oldPswd = u.GetPassword();
                u.ChangePassword(oldPswd, tb_PWOverride.Text);
                Boolean result = u.ChangePasswordQuestionAndAnswer(tb_PWOverride.Text, tb_SecQuest.Text, tb_SecAns.Text);

                if (result)
                    Msg.Text = "Password Question and Answer has been updated.";
                else
                    Msg.Text = "Password Question and Answer was not updated.";
            }
            catch (Exception )
            {
                Msg.Text = "Change Failed. Please re-enter your values and try again.";
            }
        }

    }
}

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