private void frmBook_Load(object sender, EventArgs e)
{
Sach_BUS sachBUS = new Sach_BUS();
dtgBook.AutoGenerateColumns = false;
dtgBook.DataSource = sachBUS.LayDanhSachSach();
}
private void frmBorrow_Return_Load(object sender, EventArgs e)
{
dtgBorrow_Return.AutoGenerateColumns = false;
dtgBorrow_Return.DataSource = ctms_BUS.LayCTMuonSach();
DataGridViewComboBoxColumn col = (DataGridViewComboBoxColumn)MaSach;
col.DataSource = sach_BUS.LayDanhSachSach();
col.DisplayMember = "TenSach";
col.ValueMember = "MaSach";
txtBorrowReturn_ReturnID.Text = trasach_BUS.PhatSinhMaTraSach();
}