private void txtGioVao_Properties_EditValueChanged(object sender, EventArgs e)
{
dtPhong = DatPhongBUS.LayCacPhongConTrongTrongThoiGian(txtGioVao.Time, ThamSoBUS.LayKhoangThoiGianToiThieuGiuaHaiLanThue());
dtPhong.Columns.Add(new DataColumn("colThoiDiemDatPhongGanNhat_Sau"));
dtPhong.Columns.Add(new DataColumn("colThoiDiemDatPhongGanNhat_Truoc"));
dtPhong.Columns.Add(new DataColumn("colTinhTrangPhong"));
foreach (DataRow r in dtPhong.Rows)
{
DateTime t = DatPhongBUS.LayThoiDiemDatPhongGanNhat_Sau((int)r["MaPhong"], txtGioVao.Time);
r["colThoiDiemDatPhongGanNhat_Sau"] = t == DateTime.MinValue ? "Không có" : t.ToString("dd/MM/yyyy hh:mm");
t = DatPhongBUS.LayThoiDiemDatPhongGanNhat_Truoc((int)r["MaPhong"], txtGioVao.Time);
r["colThoiDiemDatPhongGanNhat_Truoc"] = t == DateTime.MinValue ? "Không có" : t.ToString("dd/MM/yyyy hh:mm");
r["colTinhTrangPhong"] = PhongBUS.LayTinhTrangPhong((int)r["MaTinhTrangPhong"]).TinhTrangPhong + " " + (listPhongDangThue.ContainsKey((int)r["MaPhong"])? "(" + ToCustomString((DateTime.Now - listPhongDangThue[(int)r["MaPhong"]].GioThuePhong)) + ")":"");
}
txtPhong.Properties.DataSource = dtPhong;
selectedPhong.Clear();
txtPhong.Refresh();
}