private void Uc_DanhMuc_Load(object sender, EventArgs e)
        {
            nhanVien nv = db.nhanViens.Where(s => s.maNV == frmLogin.GetID.id).FirstOrDefault();

            if (nv.maCV == "cv2")
            {
                pnlNhanVien.Visible  = false;
                pnlKhachhang.Visible = false;
                pnlTaiKhoan.Visible  = false;
                pnlNCC.Visible       = true;
                pnlJob.Visible       = false;
            }
            else if (nv.maCV == "cv3")
            {
                pnlNhanVien.Visible  = false;
                pnlKhachhang.Visible = true;
                pnlTaiKhoan.Visible  = false;
                pnlNCC.Visible       = false;
                pnlJob.Visible       = false;
            }
            pnlNhanVien.Controls.Clear();
            Uc_Employees uc_Employees = new Uc_Employees();

            pnlNhanVien.Controls.Add(uc_Employees);
        }
        private void tctDanhMuc_SelectedIndexChanged(object sender, EventArgs e)
        {
            switch (tctDanhMuc.SelectedIndex)
            {
            case 0:
            {
                pnlNhanVien.Controls.Clear();
                Uc_Employees employees = new Uc_Employees();
                pnlNhanVien.Controls.Add(employees);
                break;
            }

            case 1:
            {
                pnlKhachhang.Controls.Clear();
                Uc_Customer customer = new Uc_Customer();
                pnlKhachhang.Controls.Add(customer);
                break;
            }

            case 2:
            {
                pnlTaiKhoan.Controls.Clear();
                Uc_TaiKhoan taiKhoan = new Uc_TaiKhoan();
                pnlTaiKhoan.Controls.Add(taiKhoan);
                break;;
            }

            case 3:
            {
                pnlNCC.Controls.Clear();
                Uc_NCC provider = new Uc_NCC();
                pnlNCC.Controls.Add(provider);
                break;
            }

            case 4:
            {
                pnlJob.Controls.Clear();
                UC_new_PhanViec phanViec = new UC_new_PhanViec();
                pnlJob.Controls.Add(phanViec);
                break;
            }
            }
        }