delete multiple rows in datagridview using check box

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 DELROWS : Form
    {
        public DELROWS()
        {
            InitializeComponent();
        }
        SqlConnection CON = new SqlConnection("Data Source=.;Initial Catalog=DATAENTRY;Integrated Security=True;Pooling=False");
        private void button12_Click(object sender, EventArgs e)
        {
            SqlDataAdapter asdf = new SqlDataAdapter("select * from Register",CON);
            DataTable ss = new DataTable();
            asdf.Fill(ss);
            dataGridView1.Rows.Clear();
            foreach (DataRow data in ss.Rows)
            {
                int aa = dataGridView1.Rows.Add();
                dataGridView1.Rows[aa].Cells[0].Value = "true";
                dataGridView1.Rows[aa].Cells[1].Value = data["id"].ToString();
                dataGridView1.Rows[aa].Cells[2].Value = data["name"].ToString();
                dataGridView1.Rows[aa].Cells[3].Value = data["gender"].ToString();
                dataGridView1.Rows[aa].Cells[4].Value = data["age"].ToString();
                dataGridView1.Rows[aa].Cells[5].Value = data["salary"].ToString();
                dataGridView1.Rows[aa].Cells[6].Value = data["tax"].ToString();
                dataGridView1.Rows[aa].Cells[7].Value = data["status"].ToString();
            }
            label2.Text = "label";


        }


        private void button1_Click(object sender, EventArgs e)
        {
            foreach (DataGridViewRow dataRow in dataGridView1.Rows)
            {
                if (bool.Parse(dataRow.Cells[0].Value.ToString()))
                {
                    label2.Text = dataRow.Cells[0].RowIndex.ToString();
                    SqlDataAdapter abc = new SqlDataAdapter("delete from register where id='" + dataRow.Cells[1].Value.ToString() + "' ", CON);
                    DataTable bb = new DataTable();
                    abc.Fill(bb);
                    
                }
            }
            MessageBox.Show("Successfully Deleted Selected Rows...!!");
        }
    }
}

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