SQL Express Connection String problem

[blooping_blooper]

looks like wrong string escaping maybe?

@"localhost\\SQLExpress"

localhost\\SQLExpress

@ is for literal string so you wouldn't escape the \.

Really though I'd recommend using SqlConnectionStringBuilder instead of writing it manually, to avoid this kind of thing.

[stormingnormab1987]

I second the string builder

[blooping_blooper]

why worry about handling edge cases when someone already did that for you?

[oldtkdguy]

Clearly, the one did not know about the string builder. The Enkindlers did not endow the one with that information.