while (rt.HasRows)
{
                        while (rt.Read())
                        {
                            ProjectInfo model = new ProjectInfo();
                            if (!rt.IsDBNull(0))
                            {

                                model.XMXX_DWMC = rt.GetString(0);
                            }


                            entities.Add(model);

                        /**If I comment on this statement,  the program would be infinitely run. But If I did not comment on it,
						rt seems like not to read the next row. I am certanly sure there are lots of rows in datareader.But I only get
                    the first row .
                         **/
                            rt.NextResult();
                        }
}