在部署asp.net web应用程序时，在DAL类库中修改连接字符串设置的首选方法是什么?

I deployed my asp.net web app project that has a reference to my DAL class library. How can I change the connection string in my DAL library once deployed? The DAL code was ignoring my web.config connection string and trying to use the app.config value. I deployed my asp.net web app project that has