hi my website is http://www.lindamoodbell.com my site is in redesign stage, current page is like this http://www.lindamoodbell.com/programs/seeing-stars.html and after redesign page will be http://www.lindamoodbell.com/programs/seeing-stars.aspx so is this affect my site any way in traffic or rank bcoz i have very good rank in most of 2 phrase keyword and having good traffic ? also is there any facility in asp .net who can help me in seo to make better seo friendly structure ? also i need to know latest way of getting traffic generation free or paid ?
If you are changing content or coding, you can have changes in rankings. Is there a reason you don't want to use url rewriting or mapping so the pages will still display as xxxx.html instead of xxxx.aspx? You are going to need to do redirects if you don't so that your current backlinks aren't going to be lost.
As you are changing from HMTL to aspx, this will effect any backlinks you have built to the .html pages, because it is a different file extension.