如何在配置文件中写数据库连接语句？
我用bs三层结构架构系统，用.net   开发，请问如何在配置文件中写数据库连接，写一个就可以在data层调用！请大家帮帮忙   ！

------解决方案--------------------
<connectionStrings>
<add name= "DatabaseConnection "
connectionString= "Data Source=(local);Initial
Catalog=Northwind;Integrated Security=SSPI; "
KeyRestrictions= "Encrypt=;Packet Size=; "
KeyRestrictionBehavior= "AllowOnly " />
</connectionStrings>

------解决方案--------------------
<appSettings> 节点下：
<add key= "strConnection " value= "server=192.168.0.20;database=IMS;user id=sa;password=123456; " />

引用：public static readonly string connString = System.Configuration.ConfigurationSettings.AppSettings[ "strConnection "];
------解决方案--------------------
WebConfigurationManager.ConnectionStrings
使用的时候这样使用就可以了
或者用GetSection