private void dgvListBook_CellClick(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex == -1)
{
return;
}
DataGridViewRow row = dgvListBook.Rows[e.RowIndex];
txtID.Text = row.Cells[0].Value.ToString();
txtName.Text = row.Cells[1].Value.ToString();
txtDate.Text = row.Cells[2].Value.ToString();
String name = authordao.searchAuthorName(row.Cells[3].Value.ToString());
cbAuthor.SelectedIndex = cbAuthor.Items.IndexOf(name);
String category = categorydao.searchCategoryName(row.Cells[4].Value.ToString());
cbCategory.SelectedIndex = cbCategory.Items.IndexOf(category);
String pub = publisherdao.searchPublisherName(row.Cells[5].Value.ToString());
cbPub.SelectedIndex = cbPub.Items.IndexOf(pub);
txtQuan.Text = row.Cells[6].Value.ToString();
}