如何在我想要查找记录的地方添加搜索按钮代码，并希望在listBoxes

Question

我是C＃的新手，我正在制作一个简单的数据库项目，其中我要添加一个功能，如果用户输入身份编号并单击按钮，所有记录将显示在列表框中...请帮助我完成它......我要添加的代码位于button2_click代码的最后一部分。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace main_form
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=windowDb;Integrated Security=True;Pooling=False");
        SqlCommand command = new SqlCommand();
        //SqlDataReader dataSearch;

        private void Form1_Load(object sender, EventArgs e) {}

        private void monthCalendar1_DateChanged(object sender, DateRangeEventArgs e) {}

        private void btn_save_Click(object sender, EventArgs e)
        {
            if(id_Txt.Text!=""& f_txt.Text!=""& Lname_txt.Text!=""& m_txt.Text!=""& dateTimePicker1.Text!=""){
            command.Connection = con;
            con.Open();

            command.CommandText = "insert into people(id,fname,lname,mobile,TDATE) values('"+id_Txt.Text+"','"+f_txt.Text+"','"+Lname_txt.Text+"','"+m_txt.Text+"','"+dateTimePicker1.Text/*Value.ToString()*/+"')";
            command.ExecuteNonQuery();
            con.Close();

            MessageBox.Show("Data Saved Successfully");
            id_Txt.Clear();
            f_txt.Clear();
            Lname_txt.Clear();
            m_txt.Clear();
            dateTimePicker1.Value = DateTime.Now;
            search();
            }
        }
        private void search() {

            listBox1.Items.Clear();
            listBox2.Items.Clear();
            listBox3.Items.Clear();
            listBox4.Items.Clear();
            listBox5.Items.Clear();
            con.Open();
            command.CommandText = "select * from people";
            command.Connection = con;

            SqlDataReader dataSearch = command.ExecuteReader();


            if(dataSearch.HasRows){
                while (dataSearch.Read())
                {
                    listBox1.Items.Add(dataSearch["id"].ToString());
                    listBox2.Items.Add(dataSearch["fname"].ToString());
                    listBox3.Items.Add(dataSearch["lname"].ToString());
                    listBox4.Items.Add(dataSearch["mobile"].ToString());
                    listBox5.Items.Add(dataSearch["TDATE"].ToString());
                }
                }

          con.Close();
        }

        private void btn_view_Click(object sender, EventArgs e)
        {
            search();
        }

        private void bn_update_Click(object sender, EventArgs e)
        {
            if (id_Txt.Text != "" & f_txt.Text != "" & Lname_txt.Text != "" & m_txt.Text != "" & dateTimePicker1.Text != "")
            {
                command.Connection = con;
                con.Open();
                command.CommandText = "update people  set fname='" + f_txt.Text + "',lname='" + Lname_txt.Text + "',mobile='" + m_txt.Text + "',TDATE='" + dateTimePicker1.Text + "' where id='" +id_Txt.Text + "'";
                command.ExecuteNonQuery();
                con.Close();

                MessageBox.Show("Data updated Successfully");
                id_Txt.Clear();
                f_txt.Clear();
                Lname_txt.Clear();
                m_txt.Clear();
                dateTimePicker1.Value = DateTime.Now;
                search();
            }
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            ListBox list = sender as ListBox;
            if(list.SelectedIndex!=-1)
            {
                listBox1.SelectedIndex = list.SelectedIndex;
                listBox2.SelectedIndex = list.SelectedIndex;
                listBox3.SelectedIndex = list.SelectedIndex;
                listBox4.SelectedIndex = list.SelectedIndex;
                listBox5.SelectedIndex = list.SelectedIndex;

             //   retrive to TextBox of AllowDrop events;
               /* id_Txt.Text = listBox1.SelectedIndex.ToString();
                f_txt.Text = listBox2.SelectedIndex.ToString();
                Lname_txt.Text = listBox3.SelectedIndex.ToString();
                m_txt.Text = listBox4.SelectedIndex.ToString();
                dateTimePicker1.Value = DateTime.Now;*/

                id_Txt.Text = listBox1.SelectedItem.ToString();
                f_txt.Text = listBox2.SelectedItem.ToString();
                Lname_txt.Text = listBox3.SelectedItem.ToString();
                m_txt.Text = listBox4.SelectedItem.ToString();
                dateTimePicker1.Value = DateTime.Now;
            }
        }

        private void btn_delete_Click(object sender, EventArgs e)
        {
            if (id_Txt.Text != "")
            {
                command.Connection = con;
                con.Open();
                command.CommandText = "delete from people where id='" + id_Txt.Text + "'";
                command.ExecuteNonQuery();
                con.Close();

                MessageBox.Show("Data deleted Successfully");
                id_Txt.Clear();
                f_txt.Clear();
                Lname_txt.Clear();
                m_txt.Clear();
                dateTimePicker1.Value = DateTime.Now;
                search();
            }

        }

        private void label1_Click(object sender, EventArgs e) {}

        private void button1_Click(object sender, EventArgs e) {}

        private void button2_Click(object sender, EventArgs e)
        {
            if (text_search.Text == "")
            {
                MessageBox.Show("Enter the Rollno.");
            }
            else {

            }
        }
    }
}