page state, maintenance page-level error handling 2nd page-level tracing enabling Page_Error event handler Page_Load method pageOutput attribute, <trace> element PagerStyle-Mode, DataGrid control PagerStyle-PageButton attribute, DataGrid control pages access restriction selected pages caching browser type and custom strings and query string parameters and version and controls, focus forms, submitting headers, multiple pages size , ViewState and templates paging, DataGrid control and sorting and parameters, authentication ticket parse errors, web.config Passport authentication path attribute, <forms> element patterns, matching on data entry performance <ViewState> element page size and data access, SQL Server databases DataAdapter method and DataReader method and read-only access speed StringBuilder object concatenation speed <ViewState> element personalized information, users pop ups, DataGrid control row deletion confirmation row details postbacks, state value and principal object processing files, uploaded ProcessRequest method properties custom controls DocumentSource ErrorPage protection attribute, <forms> element