Connect to Oracle database in dotnet mvc application

Oracle released a beta version driver ODP for dotnet core 2(Finally!). But I can't make it work. Does anybody did it? If yes, please send me the code or help me fixing this one \o

Useful: I am using Visual Code, project "dotnet new mvc" (.net 2) and I installed Oracle.ManagedDataAccess.Client via Nuget Add Package facility (CTRL + P, ...) Here my code:

public static OracleConnection AbrirSigmaUser(AutenticacaoModel autenticacao)
        {
            try
            {

                string _connectionString;

                _connectionString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.0.15)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=databaseName)));User Id=UserName;Password=***;";


                OracleConnection conexao = new OracleConnection();
                conexao.ConnectionString = _connectionString;

                //right here the program exit
                conexao.Open();             




                return conexao;
            }
            catch (System.Exception ex)
            {               

                throw new Exception("Não foi possível conectar ao banco de dados!" + "\nErro: " + ex.Message);
            }
        }

The compiler was throwing a lot of exceptions about missing dlls, so I installed them via Nuget Add Package facility:

//required for connection
using Oracle.ManagedDataAccess.Client;
using System.Configuration;
using System.Security.Permissions;
using System.Security.Principal;

After adding all dlls asked, the program goes to conexao.Open() and never comes back, throwing an unhandled exception:

Unhandled Exception: System.TypeLoadException: Could not load type 'System.Security.Principal.WindowsImpersonationContext' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
   at OracleInternal.ConnectionPool.PoolManager`3.CreateNewPRThreadFunc(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
The program '[8860] Sensatta-Analytcs.dll' has exited with code 0 (0x0).

Is all of it really needed to make a simple connection?

If there's something missing(e.g code samples) in order to figure out my issue, just tell me!