My recommendation would be to have 2 connection strings in the configuration file (app or web). There is a special section for them intuitively called ConnectionStrings . You can then switch between them based on other settings.
Changing connection strings dynamically is actually pretty easy to do as long as you have a place to store the new settings (ie. Web or app config files). If you provide a way for them to enter the server information you can use the ConfigurationManager class to update your app/web.config.
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