System.NullReferenceException: 未将对象引用设置到对象的实例。？？？

[HYMR101]

vs 2008+sql 2005



web.config :
<addkey="ConnString" value="Server=.;DataBase=E:\HANAO\DATA\HANAOJYDQ.MDF;user id=;password=;"/>


string connectionStringS=ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;
异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。？？？

[mqc507]

<addkey="ConnString" value="Server=.;DataBase=E:\HANAO\DATA\HANAOJYDQ.MDF;user id=;password=;"/>  

你看清楚你是用的 AppSetting还是 ConnectionString ？

string connectionStringS=ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;    

还是

string connectionStringS=ConfigurationManager.AppSetting["ConnString"].ToString（）;