There you can hack:
Assuming you don’t need the Security Question feature, you can call the method ResetPassword()in the Membership API and then use the return value of this method as the old value for ChangePassword().
Something like that:
Membership.GetUser().ChangePassword(Membership.GetUser().ResetPassword(), "new password");
There's a more complicated hack that you can use if you need Security Q & A.
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