Using the HTML Agility Package to modify web pages
Step 1: Create a new Visual Studio project Create a new Console application: Step 2: Use the Package Manager console to install the HTML Agility package. Select Tools > NuGet Package Manager > Package Manager Consol Enter: Install-Package HtmlAgilityPack Step 3: Add the reference to the HtmlAgilityPack.dll Right click you References folder, and browse to the HtmlAgilityPack.dll file that gets installed to the 'packages' folder in your Visual Studio project. Select and add this file: Step 4: Try it on some examples 1. Insert the 'DOCTYPE' comment before the main tag and insert a "