Do we have to re-publish the Web-site if we modify a part of the code in the aspx pages?

Do we have to re-publish the Web-site if we modify a part of the code in
the aspx pages?

My doubt is, If we make a slight modification of the code in the C# page
or in the aspx page, do we have to republish the entire web-site after the
modification?
I am using VS-2008 professional and the code is written in C#.
Thanks in advance.
Regards, Nitesh