Avoiding Duplicate form submission in Asp.net MVC by clicking submit twice

Question

I am rendering a form in Asp.net MVC with a submit button. The page redirects after successful record addition into the database. Following is the code :-

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Answer 1

Disabling the button is fine via JavaScript but what if the user has it disabled or they bypass it? If you use client side security then back it up with server side. I would use the PRG pattern here.