从单独的配置文件中读取设置

My asp.net app has is using a web.config for common configuration. I also have a section that maps some data objects to connection strings, and that section is going to be couple thousand of lines. I want to move that section to another config file "dataMappings.config", so I don't bulk up web.config - is there a standard mechanism of accessing that config file?My asp.net app has is using a web.config for co