我这样写,她提示我过时,应该怎么修改?

Question

string dbprovider = ConfigurationSettings.AppSettings["dbprovider"];我这样写,她提示我过时,应该怎么修改?
警告 1 “System.Configuration.ConfigurationSettings.AppSettings”已过时:“This method is obsolete, it has been replaced by System.Configuration!System.Configuration.ConfigurationManager.AppSettings” D:\web_code\test.aspx.cs 23 29 D:\

Answer 1

string dbprovider =
　　System.Configuration!System.Configuration.ConfigurationManager.AppSettings["dbprovider"];咯

Answer 2

更正：
string dbprovider =
　　System.Configuration.ConfigurationManager.AppSettings["dbprovider"];

Answer 3

string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["dbprovider"].ConnectionString;