web开发时读取web.config中的数据库连接字符串的方法

虽说Vs 2k5中新的ado.net使我们更快的开发，甚至可以完全不用手写连接数据库代码，但有时还是要得到connectionString的。写在这里吧。。。

========web.config文件如下===========
<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
 <configSections>
  <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data"/>
 </configSections>
 <connectionStrings>
  <remove name="LocalSqlServer"/>
  <add name="LocalSqlServer" connectionString="Data Source=.;Integrated Security=True;Initial Catalog=Morning2" providerName="System.Data.SqlClient"/>
 </connectionStrings>
 <dataConfiguration defaultDatabase="LocalSqlServer"/>
 <!--这一句给EnterpriseLibrary.Data的连接字符串用-->
 <system.web>
 // 略
 </system.web>
</configuration>
==================================

使用时using System.Configuration：

ConnectionStringSettingsCollection cssc = System.Web.Configuration.WebConfigurationManager.ConnectionStrings;
string conStr = cssc["LocalSqlServer"].ConnectionString ;

----------------或者-----------------
string conStr = ConfigurationManager.ConnectionStrings["LocalSqlServer"].ConnectionString;