(单选题)14: 以下是ASP.NET应用程序Web.config文件中的部分代码,为了获得配置节DSN的值,下列方法正确的是()
<appSettings>
<add key="DSN" value="data source =YONGPING;Integrated" Security=SSPI;Initial Catalog=northwnd"/>
</appSettings>
A: string strDSN=System.Configuration.ConfigurationSettings.AppSettings["DNS"];
B: string strDSN=System.Configuration.ConfigurationSettings.AppSettings("DNS");
C: string strDSN=System.Configuration.ConfigurationSettings.GetSettings("DNS");
D: string strDSN=Syst
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