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<connectionStrings>
<add name="testKey" connectionString="Data Source=.;Initial Catalog=数据库;User ID=sa;Password=2010" providerName="System.Data.SqlClient"/>
...
</connectionStrings>
<appSettings>
<add key="frist" value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="/>
<add key="second" value="~/data/test.mdb"/>
</appSettings>
//读取第一个连接
public static readonly string ConnectionString=ConfigurationManager.ConnectionStrings["test"].ConnectionString;
//去读第二个
public static readonly string connStr = ConfigurationManager.AppSettings["frist"].ToString() + HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["second"]);