Today’s README file explains how to create connection strings to SQL Server databases using Visual Studio’s built-in tools. To provide an example using real source, I created a simple Winforms ...

You can store your connection string in the registry, that way you dont have to worry about overwriting your live web.config.<BR><BR>Another way would be to have all your conn strings (dev & live ...

Based on your connection string, you are using Excel 2007 or greater. But I guess that is apparent too by the .xlsx file extension. Did you verify the FilePath variable is correct?