SqlConnection con = new SqlConnection(
                ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ConnectionString

 I use vs2003 fault:

 “string”并不包含对“ConnectionString”的定义
fault

你将你的SQLCONNECTIONSTRING在web.config中定义，完了在别的页面这样引用……
SqlConnection con = new SqlConnection(
                ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"]）