Books.cs

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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 BookShopTuto
{
    public partial class Books : Form
    {
        public Books()
        {
            InitializeComponent();
            Populate();
        }

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

        private void Populate()
        {
            try
            {
                Con.Open();
                string query = "select * from BookTb1";
                SqlDataAdapter sda = new SqlDataAdapter(query, Con);
                SqlCommandBuilder builder = new SqlCommandBuilder(sda);
                var ds = new DataSet();
                sda.Fill(ds);
                BookDGV.DataSource = ds.Tables[0];
                Con.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void Filter()
        {
            if (CatSearchCb.SelectedIndex != -1)
            {
                try
                {
                    Con.Open();
                    string query = "select * from BookTb1 where BCat = '" + CatSearchCb.SelectedItem.ToString() + "'";
                    SqlDataAdapter sda = new SqlDataAdapter(query, Con);
                    SqlCommandBuilder builder = new SqlCommandBuilder(sda);
                    var ds = new DataSet();
                    sda.Fill(ds);
                    BookDGV.DataSource = ds.Tables[0];
                    Con.Close();
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.Message);