My largest ASP.NET website exists in both a live and test version. The code for both sites is generally the same and they share the same VS 2010 website project, though they use separate SQL Server databases. I also maintain two versions of the web.config file with dummy names (web.configLIVE and web.configTEST) and rename a copy of whichever of these meets my current needs as web.config.
The test version of web.config has now been updated from .NET 3.5 to 4.0 and I now want to make the same change for the live version. However, when I go to the Property Pages and select the Build tab I am unable to re-run the change of Target Framework to 4.0 as Visual Studio thinks it has already been done. Is there a setting I can change somewhere that would let me repeat the upgrade to 4.0?
David