请问连接数据库的配置文件改怎么写
<?xml   version= "1.0 "   encoding= "utf-8 "   ?>
<configuration>
        <configSections>
            该处应该如何写？？？
        </configSections>
</configuration>

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<PWebConfiguration>
<!-- example -->
<add key= "PWeb.ConnectionString " value= "user id=aaa;data source=datasource;password=bbb " />
</PWebConfiguration>

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楼上正解。
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想怎么写都可以阿
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<?xml version= "1.0 " encoding= "utf-8 " ?>
<configuration>
<configSections>
<add key= "ConnectionString " value= "user id=aaa;data source=datasource;password=bbb " />
</configSections>
</configuration>

然后读 "ConnectionString "就行了。
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<add key= "connectionstring " value= "server=电脑IP;database=数据库名称;uid=sa;password=sa; "/>
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取：
ConfigurationManager.AppSettings[ "connectionstring "]
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<add key= " " value= " " /> 不是放在configSections节里面的，而是放在appSettings节里面，只有放在这里，你才能用以下方法来取：
ConfigurationManager.AppSettings[ " "];

------解决方案--------------------
<?xml version= "1.0 " encoding= "utf-8 " ?>
<configuration>
<connectionStrings>
<add name= "sqlConnectionString " connectionString= "Data Source=.;Initial Catalog=GSIM;Integrated Security=True "/>
</connectionStrings>
</configuration>

添加应用----System.Configuration
再using System.Configuration;
得到连接字符串:ConfigurationManager.ConnectionStrings[ "sqlConnectionString "].ConnectionString.ToString();
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<connectionStrings>
<add name= "sqlConnectionString " connectionString= "Data Source=.;Initial Catalog=GSIM;Integrated Security=True "/>