//dùng cho form nhân viên
        public DataTable laydlList(string maphong, string mato)
        {
            clsDMTo c = new clsDMTo();

            c.sc.Open();
            if (mato != null)
            {
                string sql = "Select N.MaNV,N.Ho,N.Ten from tbl_Nhanvien N inner join tbl_DanhMucTo T" +
                             " on N.MaTo=T.MaTo where " +
                             " N.MaPhong= '" + maphong + "' and N.MaTo='" + mato + "'";
                SqlCommand scmd = new SqlCommand(sql, c.sc);
                c.sda.SelectCommand = scmd;
                c.sda.Fill(c.ds, "NV_To");
                c.sc.Close();
            }
            else
            {
                string sql = "Select N.MaNV,N.Ho,N.Ten from tbl_Nhanvien N inner join tbl_PhongBan P" +
                             " on N.MaPhong=P.MaPhong where " +
                             " N.MaPhong= '" + maphong + "'";
                SqlCommand scmd = new SqlCommand(sql, c.sc);
                c.sda.SelectCommand = scmd;
                c.sda.Fill(c.ds, "NV_To");
                c.sc.Close();
            }
            return(c.ds.Tables["NV_To"]);
        }
        //dùng cho form bảng lương
        public DataTable laydlList(string maphong, string mato, string thang,
                                   string nam)
        {
            clsDMTo c = new clsDMTo();

            c.sc.Open();
            if (mato != null)
            {
                string sql = "Select BL.MaNV,N.Ho,N.Ten from tbl_bangluong BL inner join tbl_DanhMucTo T" +
                             " on BL.MaTo=T.MaTo  inner join tbl_nhanvien N on BL.MaNV = N.MaNV where " +
                             " BL.MaPhong= '" + maphong + "' and BL.MaTo='" + mato +
                             "' and BL.thang ='" + thang + "' and BL.nam ='" + nam + "'";
                SqlCommand scmd = new SqlCommand(sql, c.sc);
                c.sda.SelectCommand = scmd;
                c.sda.Fill(c.ds, "NV_To");
                c.sc.Close();
            }
            else
            {
                string sql = "Select BL.MaNV,N.Ho,N.Ten from tbl_BangLuong BL inner join tbl_PhongBan P" +
                             " on BL.MaPhong=P.MaPhong inner join tbl_NhanVien N on BL.MaNV = N.MaNV where " +
                             " BL.MaPhong= '" + maphong + "' and BL.thang ='" + thang + "' and BL.nam ='" + nam + "'";
                SqlCommand scmd = new SqlCommand(sql, c.sc);
                c.sda.SelectCommand = scmd;
                c.sda.Fill(c.ds, "NV_To");
                c.sc.Close();
            }
            return(c.ds.Tables["NV_To"]);
        }
        public DataSet taocombo(string maphong)
        {
            clsDMTo c = new clsDMTo();

            c.sc.Open();
            string     sql1 = "Select * from tbl_DanhMucTo where maphong ='" + maphong + "'";
            SqlCommand scmd = new SqlCommand(sql1, c.sc);

            c.sda.SelectCommand = scmd;
            c.sda.Fill(c.ds, "DanhMucTo");
            c.sc.Close();
            return(c.ds);
        }