SQL_DAL/SubjectService.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using MODEL;
using IDAL;
using SQL_DAL;

namespace SQL_DAL
{
    public class SubjectService:IDAL.ISubject
    {
        private string constring = ConfigurationManager.ConnectionStrings["seaher"].ConnectionString;
        public List<Subjectlist> Select_Subject()
        {
            string sql = "select * from tb_Subject";
            List<Subjectlist> list = new List<Subjectlist>();
            using(SqlConnection con = new SqlConnection(constring))
            {
                SqlCommand com = new SqlCommand(sql,con);
                con.Open();
                SqlDataReader reader = com.ExecuteReader();
                while(reader.Read())
                {
                    Subjectlist sublist = new Subjectlist();
                    sublist.SubjectId = Convert.ToInt32(reader[0]);
                    sublist.SubjectName = reader[1].ToString();
                    list.Add(sublist);
                }
                return list;
            }
        }
    }
}