create table student
(
 id     int  auto_increment  primary key,
 name char(10) not null,
 sex    char(10) not null,
 age   char(10) not null,   
)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string connSting;
            connSting = "server=localhost;database=student;Integrated Security=True ";
            SqlConnection sConn = new SqlConnection(connSting);
            try
            {
                sConn.Open();
            }
            catch (Exception ex)
            {
                Console.WriteLine("链接错误:" + ex.Message);
            }
            string sqlMessage=null;
            sqlMessage = "select * from student";
            SqlCommand sCmd = new SqlCommand(sqlMessage, sConn);

            SqlDataReader sdr = null;
            try
            {
                sdr = sCmd.ExecuteReader();
            
                Console.WriteLine(" 姓名   性别   年龄 ");
                while (sdr.Read())
                {
                    Console.WriteLine(sdr["name"] +""+ sdr["sex"]+"" + sdr["age"]);
                }
                sConn.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            Console.ReadLine();
        }
    }
}