common HTML parts of webpages

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ASP.NET

HTML

Hi friends.

I’m designing a website with asp.net.

In my website I have many web pages.

All pages have a same header, and same menu, and same right menu bar, and others.

Note that the main data in each page is different from others.

For this, I copy the common HTML part of each page and paste it in new page!

Common parts like these:

<div id=”headerDIV” style=… >
…
</div>

My problem is that how can I type these common parts of each page just one time and use it in all pages?

Without doing like this, I should change all pages when I wanna change a little thing in the header for example!

I think one way is to save the common HTML part in one .html file, and use it like this:
<!--#include file="header.html"-->

But, is it a best solution ?!

Isn’t it cause bad loading of the website especially for users with low speed Internet !?

Is there any better solution?

Thanks in advance.