How To Remove Auomatically Values Setting In Textbox When I Clicked Remember Password In The Mozilla Firefox

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ASP.NET

Hello,

when i login username and password .and Clicked Remember password
then when i redirect another page have duedate textbox .

duedate textbox automatically filling username .
so how to remove this username in that textbox

i did AutoCompleteType="None" autocomplete="off"
and clear all history in Mozilla but username coming in the txtduedate
when i remove save password it working fine.
but i want to do save password
how can i do??