读取连接字符串

<appSettings>
<add key="TempConnectionString" value="Data Source=.;Inital Catalog=Temp;User ID=sa;Password="/>
</appSettings>
<connectionStrings>
<add name="NorthwindConnectionString" connectionString="Data Source=.;Inital Catalog=Northwind;User ID=sa;Password=" providerName="System.Data.SqlClient"/>
</connectionStrings>

protected void Page_Load(object sender, EventArgs e)
{
this.Response.Write(WebConfigurationManager.AppSettings["TempConnectionString"]);
this.Response.Write("<br />");
this.Response.Write(WebConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
}