Managing A Debug and Release Connection String

Question

What is a good approach to managing a debug and release connection string in a .NET / SQLServer application?

I have two SQL Servers, a production and a build/debug and I

Answer 1

I usually set an Environment variable on my production servers that denotes the server is a production server. I then read the correct connection string from my web.config based on whether this Environment variable exists and is set to the production value.