private void button1_Click(object sender, EventArgs e)
        {
            con = new SqlConnection(@"Data Source=(local)\SQLEXPRESS;Initial Catalog=Car Dealership;Integrated Security=True");
            con.Open();
            SqlDataAdapter sqlDa = new SqlDataAdapter("Select * FROM LotCarID", con);
            DataTable      dtbl  = new DataTable();

            sqlDa.Fill(dtbl);

            dataGridView1.DataSource = dtbl;


            FilterLabel.Show();
            LotFilterTB.Show();
            con.Close();
        }