I work on asp.net razor page .i face issue when navigate to page after make submit it reset all values on page

I read more the issue will solved by using hidden fields.

So suppose I have asp.net razor page have username and email and i need store fields of username and email on hidden fields to be available after submit post.

So can you provide to me sample to store username and email on hidden fields so prevent value from reset after submit and can navigate to other pages

So can you please provide to me sample please?