In Html Agility Pack I could not find any option that make html page tidy.There is one option that inserts the missing closing tags but it works in some html page only.That Option in html agility pack is,
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.OptionFixNestedTags=true;
I have also tried regex for that but it also work for some html page only.
So I found the best html tidy pack is :
http://www.devx.com/dotnet/Article/20505/1763/page/2.
We can see there : how to import the dll and how to use that tidy pack, there is sample code also available. It is great at all.It can insert the missing closing tags and makes your html page tidy .
Thanks for helping everyone..