Where does this SQLExpress permanent connection string come from (not web.config)?

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Today I noticed that in my ConfigurationManager.ConnectionStrings the very first instance is .\SQLEXPRESS. I remembered explicitly removing this entry from my web.config so I checked again, but didn't find a thing. Then I did a search over my entire solution, not a single match.
Where the hell is this connection string coming from and how can I remove it?


It's in there by default, pulled in from your machine config file. To get rid of it just put

<clear />

Above your first connection string to remove it.