C# การเอา DataGridView มาสร้าง เป็นฟอร์มค้นหา (Search) แบบบ้าน ๆๆ

public  List<string> Item = new List<string>();

private void button2_Click(object sender, EventArgs e)
        {
            sett_Post_ProvinceBindingSource.Filter = "Province like '%" + textBox1.Text + "%'";
        }

private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < sett_Post_ProvinceDataGridView.RowCount; i++)
            {
                if (sett_Post_ProvinceDataGridView[0, i].Value != null && (Boolean)sett_Post_ProvinceDataGridView[0, i].Value == true)
                {
                    Item.Add(sett_Post_ProvinceDataGridView[2, i].Value.ToString());
                }
            }
            Close();
        }

private void button1_Click(object sender, EventArgs e)
        {
            Form6 f = new Form6();
            f.ShowDialog();
            if (f.Item.Count > 0)
            {
                foreach (string str in f.Item)
                {
                    textBox1.Text += Environment.NewLine +  str;
                }
            }
        }