public void SetCheDo(CheDo cheDo)
 {
     CheDoHienTai = cheDo;
     if (cheDo == CheDo.XEM)
     {
         dgv_SelectionChanged(dgv, null);
         xemMode.BackColor  = Color.LightSlateGray;
         suaMode.BackColor  = Color.LightGray;
         themMode.BackColor = Color.LightGray;
         SetReadOnly(true, txtTen, txtLop, txtCMND, txtDT, txtKhoa, txtQueQuan, txtDienUutien, txtEmail, txtMSSV, txtRFID);
         dtpNgaySinh.Enabled = false;
         btnChonFile.Hide();
         btnChupAnh.Hide();
         btnHanhDong.Hide();
         btnChonSV.Show();
     }
     else if (cheDo == CheDo.SUA)
     {
         dgv_SelectionChanged(dgv, null);
         xemMode.BackColor  = Color.LightGray;
         suaMode.BackColor  = Color.LightSlateGray;
         themMode.BackColor = Color.LightGray;
         SetReadOnly(false, txtTen, txtLop, txtCMND, txtDT, txtKhoa, txtQueQuan, txtDienUutien, txtEmail, txtMSSV, txtRFID);
         dtpNgaySinh.Enabled = true;
         btnChonFile.Show();
         btnChupAnh.Show();
         DaChonAnh = false;
         btnHanhDong.Show();
         btnHanhDong.Text = "Cập nhật";
         btnChonSV.Hide();
     }
     else if (cheDo == CheDo.THEM)
     {
         xemMode.BackColor   = Color.LightGray;
         suaMode.BackColor   = Color.LightGray;
         themMode.BackColor  = Color.LightSlateGray;
         dtpNgaySinh.Enabled = true;
         SetReadOnly(false, txtTen, txtLop, txtCMND, txtDT, txtKhoa, txtQueQuan, txtDienUutien, txtEmail, txtMSSV, txtRFID);
         Clear(txtTen, txtLop, txtCMND, txtDT, txtKhoa, txtQueQuan, txtDienUutien, txtEmail, txtMSSV, txtRFID);
         btnChonFile.Show();
         btnChupAnh.Show();
         DaChonAnh   = false;
         DuongDanAnh = null;
         btnHanhDong.Show();
         btnHanhDong.Text = "Thêm";
         btnChonSV.Hide();
     }
     else if (cheDo == CheDo.CHON_SV)
     {
         btnChonSV.Show();
     }
 }
        public void SetCheDo(CheDo cheDo)
        {
            CheDoHienTai = cheDo;
            if (CheDoHienTai == CheDo.XEM)
            {
                xemMode.BackColor   = Color.LightSlateGray;
                suaMode.BackColor   = Color.LightGray;
                themMode.BackColor  = Color.LightGray;
                txtIDPhong.ReadOnly = txtKhuNha.ReadOnly = txtSoPhong.ReadOnly = txtTinhTrang.ReadOnly = true;
                btnHanhDong.Hide();
                btnChonPhong.Show();
                dgvPhong_SelectionChanged(dgvPhong, null);
            }
            else if (CheDoHienTai == CheDo.THEM)
            {
                xemMode.BackColor  = Color.LightGray;
                suaMode.BackColor  = Color.LightGray;
                themMode.BackColor = Color.LightSlateGray;

                txtIDPhong.ReadOnly = txtKhuNha.ReadOnly = txtSoPhong.ReadOnly = txtTinhTrang.ReadOnly = false;
                txtIDPhong.Text     = txtKhuNha.Text = txtSoPhong.Text = txtTinhTrang.Text = "";
                numToiDa.Value      = 8;
                numHienTai.Value    = 0;

                btnHanhDong.Text = "Thêm phòng";
                btnHanhDong.Show();
                btnChonPhong.Hide();
            }
            else if (CheDoHienTai == CheDo.SUA)
            {
                xemMode.BackColor  = Color.LightGray;
                suaMode.BackColor  = Color.LightSlateGray;
                themMode.BackColor = Color.LightGray;

                txtIDPhong.ReadOnly = txtKhuNha.ReadOnly = txtSoPhong.ReadOnly = txtTinhTrang.ReadOnly = false;
                btnHanhDong.Text    = "Cập nhật";
                btnHanhDong.Show();
                btnChonPhong.Hide();
                dgvPhong_SelectionChanged(dgvPhong, null);
            }
            else if (CheDoHienTai == CheDo.CHON_PHONG)
            {
                LoadDuLieu();
                btnChonPhong.Show();
                cboLoaiPhong.SelectedIndex = 1;
                dgvPhong_SelectionChanged(dgvPhong, null);
            }
        }