Form10.cs

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 Jewellery_Store
{
    public partial class Form10 : Form
    {
        public void populate()
        {
            string connectionString = "Data Source=HASEEB;Initial Catalog=Shop;Integrated Security=True;";
            SqlConnection con = new SqlConnection(connectionString);
            con.Open();
            string query = "SELECT * FROM Bill";
            SqlDataAdapter da = new SqlDataAdapter(query, con);
            SqlCommandBuilder builder = new SqlCommandBuilder(da);
            var ds = new DataSet();
            da.Fill(ds);
            BilDataT.DataSource = ds.Tables[0];
            con.Close();
        }
        public Form10()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            System.Windows.Forms.Application.Exit();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
            Form6 f6 = new Form6();
            f6.Show();
        }

        private void pictureBox4_Click(object sender, EventArgs e)
        {
            System.Windows.Forms.Application.Exit();
        }

        private void Form10_Load(object sender, EventArgs e)
        {
            populate();
        }
    }
}