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<connectionStrings>
  <add name="Sales"
       providerName="System.Data.SqlClient"
       connectionString= "server=myserver;database=Products;uid=<user name>;pwd=<secure password>" />
  <add name="LocalSqlServer"
       providerName="System.Data.SqlClient"
       connectionString="server=.;database=NorthWind;Integrated Security=SSPI" />
  <add name="Sql2005Express"
        connectionString="Data Source=.\SQLEXPRESS;AttachDbFileName=|DataDirectory|NorthWnd.mdf;Integrated     Security=True;User Instance=true"
         providerName="System.Data.SqlClient"/>
</connectionStrings>
2¡¢×.cs Á¬½ÓÊý¾Ý¿â ´úÂë
   string connectionStr = System.Configuration.ConfigurationManager.ConnectionStrings["LocalSqlServer"].ToString();
3¡¢MSDN - Ë÷Òý - connectionStrings ¿ÉÒԲ鿴web.configÀïÊý¾Ý¿âÁ¬½Ó»ò¸½¼ÓÉèÖá£
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