private void toolStripButton7_Click(object sender, EventArgs e)
        {
            fMain main = new fMain();

            this.Hide();
            main.Show();
        }
        private void btnLogin_Click(object sender, EventArgs e)
        {
            if (NhanSuBUL.Instance.checkTaiKhoan(txtUser.Text, txtPass.Text))
            {
                fMain frm = new fMain();
                //frm.Nhansu = NhanSuBUL.Instance.TaiKhoan(txtUser.Text, txtPass.Text);
                Session.User     = NhanSuBUL.Instance.TaiKhoan(txtUser.Text, txtPass.Text);
                Session.UserRole = "USER";

                this.Hide();

                frm.closeForm += CloseAction;
                frm.Show();
            }
        }