OracleConnection throw null exception upon Open()

Question

When code reach .Open() method of OracleConnection object, it throw null exception, can't get why. Here is code:

using (OracleConnection connection = new OracleConnection($"User Id={dbLogin};Password={dbPass};Persist Security Info=False;Data Source={server}"))
{
    connection.Open();
}

All info being passed to connection string correctly. This sutiation happend when i'm trying to migrate from .Net oracle to ODA.NET, using Oracle.DataAccess v 4.0.3

Default System.Data.Oracle correctly opens the connection with that conenction string. Read mostly all topics about migration, no luck so far.

Answer 1

Looks like the problem was in the corrupted Oracle Client installation.

Weird part - there was just NullRef exception with no ORA errors. After i've got proper install - everything works just fine.

Also reworked my code to OracleDataAdapter instead of OracleDataReader - code works faster and more stable.