private void BookSearchGridView_CellClick(object sender, DataGridViewCellEventArgs e) { int rowIndex = e.RowIndex; DataGridViewRow row = bookSearchGridView.Rows[rowIndex]; int bookID = Convert.ToInt32(row.Cells[0].Value); try { bookIssueGridView.DataSource = SelectQueries.GetBookIssues(bookID); } catch (Exception ex) { Console.WriteLine(ex); } }