dynamically insert, update, delete datas in datagirdview in dot net

This is A C# Practice code:

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


namespace dataentry
{
    public partial class Form5 : Form
    {
        public Form5()
        {
            InitializeComponent();
        }
        SqlConnection abc = new SqlConnection("Data Source=.;Initial Catalog=DATAENTRY;Integrated Security=True;Pooling=False");
        
        SqlDataAdapter asdf;
        DataTable table;
        SqlCommandBuilder builder;
        DataSet sd;


        private void button1_Click(object sender, EventArgs e)
        {
            asdf = new SqlDataAdapter(@"SELECT ID, NAME, GENDER, AGE, SALARY, TAX, STATUS FROM REGISTER", abc);
            table = new DataTable();
            asdf.Fill(table);
            dataGridView1.DataSource = table;
        }


        private void button2_Click(object sender, EventArgs e)
        {
           
                builder = new SqlCommandBuilder(asdf);
                asdf.Update(table);
                
               


               
           
        }
    }
}

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