private void btnSave_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < dataGridView.Rows.Count - 1; i++)
            {
                string rowCode = dataGridView.Rows[i].Cells[0].Value.ToString();

                if (rowCode == txtCode.Text && txtCode.Enabled == true)
                {
                    MessageBox.Show("Code already exist! Try another one!", "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    panel.Enabled = false;
                    defaultViewButtons();
                }
            }
            try
            {
                productBindingSource.EndEdit();
                tableProducts.SaveChangesAsync();
                panel.Enabled = false;
                defaultViewButtons();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

        }