saving HTML output scalability script libraries, WebUIValidation security Forms authentication Passport authentication Windows authentication 2nd sending email messages serialized data types, custom objects server validation Server.Transfer method authentication cookies and submit form to different page services [See also web services] stress testing Session object, user information session state maintenance sessionState element attributes SetAuthCookie method SortExpression attribute, DataGrid control sorting, DataGrid control ascending /descending order DataGrid data paging and source user controls SQL Servers, data access speed state application state maintenance custom controls and information availability and maintenance multiple servers, configuration page state, maintenance postbacks and session state maintenance updatePage method state server State Service stress testing 2nd StringBuilder object concatenation speed performance and strings custom, caching and query parameters, caching and stylesheets, browser-specific Submit button, Enter key and submitting forms, different page System.Drawing classes