https://www.simple-talk.com/sql/learn-sql-server/improving-the-quality-of-sql-server-database-connections-in-the-cloud/
http://blogs.msdn.com/b/sql_pfe_blog/archive/2013/10/08/connection-pooling-for-the-sql-server-dba.aspx
HtmlAgilityPack与AngleSharp
