session 和 viewstate 的比较

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                 session        viewstate
占用服务器资源      true           false
time out            true           false
存储任何.net类型    true           false(只支持strings, integers, Booleans, arrays, ArrayList, hashtable, custom TypeConverters)
加重html负载        false          true

session 对整个 application 有效 ，而 viewstate相当于
某个页面的 session

定义 viewstate

// save in viewstate
viewstate["SortOrder"] = "DESC";

// read from viewstate
string sortOrder = (string)viewstate["SortOrder&qu

session 和 viewstate 的比较';return true">
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