c# code for datatable and dataset function 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 Difference : Form
    {
        public Difference()
        {
            InitializeComponent();
        }
        SqlConnection CON = new SqlConnection("Data Source=.;Initial Catalog=DATAENTRY;Integrated Security=True;Pooling=False");


        DataTable TTT = new DataTable();
        DataSet SSS = new DataSet();
        private void Difference_Load(object sender, EventArgs e)
        {
            
        }


        private void button1_Click(object sender, EventArgs e)
        {
            SqlDataAdapter asdf = new SqlDataAdapter("select * from Register",CON);
            asdf.Fill(TTT);
            dataGridView1.DataSource = TTT;




            SqlDataAdapter Data1 = new SqlDataAdapter("select * from Register", CON);
            asdf.Fill(SSS, "Register");
            dataGridView2.DataSource = SSS.Tables[0];




            SqlDataAdapter Data2 = new SqlDataAdapter("select * from Register", CON);
            asdf.Fill(SSS, "Register");
            dataGridView3.DataSource = SSS.Tables[0];
        }
    }
}

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