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Error in connecting aspx.cs to database situated in app_data folder [database connection error]

Have you tried localhost as opposed to (LocalDBv11.0), like this?

objconn.ConnectionString = "Data Source=localhost;Integrated
Instance=true;user id=xyz; password=xyz123; Initial Catalog=TEST";

localhost will use TCP, while (LocalDBv11.0) will use Named Pipes

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