An attempt to attach an auto-named database for file App_Dataname.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

<add name="constr" connectionString="Data Source=np:\.pipeLOCALDB#C8EDB645tsqlquery;AttachDbFilename=App_Datahands.mdf;Integrated Security=True" providerName="System.Data.SqlClient" />