private void deleteButton_Click(object sender, EventArgs e)
{
DataGridViewCell cell = dataGridView_Book.SelectedCells[0];
DataGridViewRow row = dataGridView_Book.Rows[cell.RowIndex];
Book selectedBook = GetBookFromSelectedRow(row);
int res = bookBll.Delete(selectedBook.id);
if (res != 0)
{
MessageBox.Show("Delete succeeded");
BindData(bookBll.GetAll());
}
}
