rem: CODE THAT DIDN'T WORK
<remove name ="LocalSqlServer" />
<add name="LocalSqlServer" connectionString="Data Source=hcdesktop2\sqlexpress;initial Catalogue=ASPBIS;Integrated Security=True" providerName="system.data.sqlclient" />
</connectionStrings>
THE FOLLOWING CODE DID WORK, BUT I AM NOT SURE WHY
<add name="LocalSqlServer" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|ASPBIS.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
</connectionStrings>