public bool LayMS(string mdg)
{
string sqlString = "select * from muonsach where masach = '" + mdg + "'";
return(db.kiemtra(sqlString, CommandType.Text));
}
public bool KiemTraNguoiDung(string tk)
{
string sqlString = "select * from taikhoan Where tendangnhap='" + tk + "'";
return(db.kiemtra(sqlString, CommandType.Text));
}
public bool ktratk(string tk, string mk, string quyendn)
{
string sqlString = "select * from taikhoan Where tendangnhap='" + tk + "'and matkhau='" + mk + "'and quyen='" + quyendn + "'";
return(db.kiemtra(sqlString, CommandType.Text));
}
