Hi Darcio,
Because you have no way of accessing tnsnames in a personal environment you need to use a connection string with a format that doesn't require it. i suggest using with this format or try the different ones that you can find on connectionstrings.com.
You also have the use the public address of the machine where the DB is hosted and not localhost because the server won't find a DB on that address.
Cheers,
Guilherme
Because you have no way of accessing tnsnames in a personal environment you need to use a connection string with a format that doesn't require it. i suggest using with this format or try the different ones that you can find on connectionstrings.com.
You also have the use the public address of the machine where the DB is hosted and not localhost because the server won't find a DB on that address.
Cheers,
Guilherme