How to database connection to C# to Oracle 

public OracleConnection GetConnection_Oracle()
    {
        string connStr = "Data Source=(DESCRIPTION=(ADDRESS_LIST="
        + "(ADDRESS=(PROTOCOL=TCP)(HOST=Server IP Address)(PORT=Server Port Number)))"
        + "(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=etds)(INSTANCE_NAME=etds)));"
        + "User Id=redfd;Password=dfdf;";
        OracleConnection conn = new OracleConnection(connStr);
        return conn;
    }

    public DataTable GetDataTable_Oracle(string query, out string ERROR)
    {
        OracleConnection dbCon = GetConnection_Oracle();
        dbCon.Open();
        DataTable dt = new DataTable();

        OracleCommand command = new OracleCommand();
        command.Connection = dbCon;
        command.CommandType = CommandType.Text;
        command.CommandText = query;
        command.CommandTimeout = 300;
        try
        {
            OracleDataReader dr = command.ExecuteReader();
            ERROR = String.Empty;
            dt.Load(dr);
        }
        catch (Exception ex)
        {
            //ERROR = ex.ToString();
            ERROR = "";
        }
        finally
        {
            dbCon.Close();
        }
        return dt;
    }