Windows Service (C#)- connect to oracle database

string strPass;
string strCon = "USER_NAME/PASSWORD@//DB_SERVER_HOST_OR_IP:PORT/SERVICE_NAME";
using (OracleConnection conn = new OracleConnection(strCon))
{
    conn.Open();
    using (OracleCommand cmd = new OracleCommand())
    {
        cmd.Connection = conn;
        cmd.CommandText = "SELECT * FROM emp_table WHERE username = :userId";
        cmd.CommandType = CommandType.Text;
        OracleParameter pUser = new OracleParameter();
        pUser.OracleDbType = OracleDbType.Varchar2;
        pUser.Value = "xyz";
        cmd.Parameters.Add(pUser);
        using (OracleDataReader dr = cmd.ExecuteReader())
        {
            dr.Read();
            //strPass = dr["pwd"].ToString();
            strPass = dr.GetOracleString(1)); // Assuming that the pwd is a second column.
        }
    }
}