ado显示，删除后刷新重新显示

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

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            //1.显示表格内容
            //引用数据库命名空间
            //建立数据库连接
            SqlConnection conn = new SqlConnection("server=.;database=data0425;user=sa;pwd=123;");
            //在数据库连接基础上建立数据库操作
            SqlCommand cmd = conn.CreateCommand();
            //编写sql操作命令
            cmd.CommandText = "select code,name,score from student";
            //执行操作
            //开启数据库
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if(dr.HasRows)
            {
                while(dr.Read())
                {
                    Console.WriteLine(dr["code"]+"  "+dr["name"]+"   "+dr["score"]);
                }
            }

            //关闭数据库
            conn.Close();


            //2.删除s107
           
            Console.Write("请输入需要删除的学号：");
            string scode=Console.ReadLine();
            //编写删除指令
            cmd.CommandText = "delete from student where code='"+scode+"'";
            //进行操作
            try
            {
                //开启数据库
                conn.Open();
                //执行操作
                cmd.ExecuteNonQuery();
                Console.Clear();
                Console.WriteLine("删除成功！");

            }
            catch
            {
                Console.WriteLine("连接数据库失败！请重新连接");
            }
            finally
            {
                //关闭数据库
                conn.Close();
            }

            //3.刷新并显示删除后的表格

            //编写sql操作命令
            cmd.CommandText = "select code,name,score from student";
            //执行操作
            //开启数据库
            conn.Open();
            SqlDataReader dr1 = cmd.ExecuteReader();
            if (dr1.HasRows)
            {
                while (dr1.Read())
                {
                    Console.WriteLine(dr1["code"] + "  " + dr1["name"] + "   " + dr1["score"]);
                }
            }

            //关闭数据库
            conn.Close();





            Console.ReadLine();
        }
    }
}