用于模拟HTTP事务的库，例如具有cookie和会话支持的浏览器

I wonder if there is a .NET library that mimics a browser in terms of HTTP transactions. In other words I am going to make multiple GET/POST requests and I want the cookies to be persisted to a storage, so that consecutive request will be identified by the remote host. AFAIK I wonder if there is a .NET library that mimics