Connection string oracle schema table C#

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Oracle

Database name is TEST, user name test, pass test1234

I create a fake account, conection to db work.
Data are located on next loaction:
When conect to db OTHER USERS/MASTER/Table1
How to read that data to datagrid?
I try this code and have error:

NETWORK LIBRARY: Name-Value syntax error
Error number: ORA-00303

What I have tried:

private void TABLE_fill()
       {
           String connectionString = "Data Source=("
                                + "   TEST = "
                                + " (DESCRIPTION = "
                                + "   (ADDRESS = (PROTOCOL = TCP)(HOST = 
                                test.localdomain.intra)(PORT = 1521)) "
                                + " (CONNECT_DATA = "
                                + "    (SERVICE_NAME = TEST) "
                                + "    (INSTANCE_NAME = TEST) "
                                + " ) "
                                + " ) "
                                + " User Id=test; password=test1234; ";

           OracleConnection con = new OracleConnection();
           con.ConnectionString = connectionString;
           con.Open();

           OracleCommand cmd= new OracleCommand();
           cmd.CommandText = "select * from Table1";
           cmd.Connection= con;
           cmd.CommandType = CommandType.Text;
           //cmd.ExecuteNonQuery();

           OracleDataReader dr = cmd.ExecuteReader();
           dr.Read();
           System.Data.DataTable dataTable = new System.Data.DataTable();
           dataTable.Load(dr);
           ListDataGridView.DataSource = dataTable;

           ListDataGridView.Update();
           ListDataGridView.Refresh();
}