Get connection string from Web.Config in n-tier application

Dear All,

I have created an n-tier application, consisting of the UI, WCFService, ServiceLayer, and DAL.  I want these to be independent of each other, since they can be moved on different servers.

Now in the DAL, I encountered a problem.  how can I call the connection string from the Web.Config file?  Normally, when the DAL is part of the whole project, I used to call it something like this:-

string strConnectionString = ConfigurationManager.AppSettings["ConnectionString"].ToString();

However now, the DAL is in a different project altogether.  How can I reference this?

Your help is very much appreciated.

Thanks

Johann