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()); } }