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From: Harlan Messinger on 27 Mar 2010 11:18
I'm using Visual Studio 2008 and SQL Server Express 2008. I've built the
beginnings of an ASP.NET 3.5 app that reads a connection string from the
configuration, in the usual way, and I can use LINQ-to-SQL against it
and output listings of data from the database to a page with no problem.

But I've created a custom membership provider that uses this string to
create a data context for LINQ-to-SQL, and placed a Login control on a
page that uses this membership provider. This page opens fine when I run
it from Visual Studio, but when I enter some text into the login form
and submit it, the error message "Failed to generate a user instance of
SQL Server. Only an integrated connection can generate a user instance."
appears in the browser. Visual Studio, meanwhile, doesn't give me any
indication that there's a problem. The details under the error message
in the browser go on about the App_Data directory, but my App_Data
directory is empty and I haven't referred to it anywhere.

Any ideas on the source of the trouble?
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