DashBoard.cs

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

namespace BookShopTuto
{
    public partial class DashBoard : Form
    {
        public DashBoard()
        {
            InitializeComponent();
        }

        private void label8_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void label6_Click(object sender, EventArgs e)
        {
            Books obj = new Books();
            obj.Show();
            this.Hide();
        }

        private void label7_Click(object sender, EventArgs e)
        {
            Users obj = new Users();
            obj.Show();
            this.Hide();
        }

        private void label9_Click(object sender, EventArgs e)
        {
            DashBoard obj = new DashBoard();
            obj.Show();
            this.Hide();
        }

        private void label10_Click(object sender, EventArgs e)
        {
            Login obj = new Login();
            obj.Show();
            this.Hide();
        }

        SqlConnection Con = new SqlConnection(@"Data Source=.;Initial Catalog=WhiteBookShopDb;Integrated Security=True;");

        private void DashBoard_Load(object sender, EventArgs e)
        {
            try
            {
                Con.Open();