//nut cap nhap nhan vien
        private void button37_Click(object sender, EventArgs e)
        {
            NHANVIEN entity = new NHANVIEN();

            entity.MANV      = suatxtidnhanvien.Text;
            entity.TENNV     = suatxtten.Text;
            entity.MATKHAU   = suatxtmatkhau.Text;
            entity.NGAYSINH  = dateTimePicker6.Value.Date;
            entity.DIACHI    = suatxtdiachi.Text;
            entity.DIENTHOAI = suatxtsdt.Text;
            // entity.PHANQUYEN = suatxtphanquyen.Text;
            if (comboBox2.SelectedItem.Equals("Admin"))
            {
                entity.PHANQUYEN = true;
            }
            else if (comboBox2.SelectedItem.Equals("User"))
            {
                entity.PHANQUYEN = false;
            }
            nhanvienbus bus = new nhanvienbus();

            bool success = bus.update(entity);

            common.successorerror(success);
            if (success)
            {
                common.ClearTextBoxes(tabPage17);
                thanhviendgv.DataSource = bus.findall(textBox19.Text);
                thanhviendgv.Columns["NHANVIENs"].Visible = false;
            }
            else
            {
                ViewErrors(bus.validatedictionary);
            }
        }
        private void textBox19_TextChanged(object sender, EventArgs e)
        {
            nhanvienbus bus = new nhanvienbus();

            thanhviendgv.DataSource = bus.findall(textBox19.Text);
            thanhviendgv.Columns["MANV"].HeaderText      = "Mã nhân viên";
            thanhviendgv.Columns["TENNV"].HeaderText     = "Tên nhân viên";
            thanhviendgv.Columns["DIACHI"].HeaderText    = "Địa chỉ";
            thanhviendgv.Columns["DIENTHOAI"].HeaderText = "Điện thoại";
            thanhviendgv.Columns["NGAYSINH"].HeaderText  = "Ngày sinh";
            thanhviendgv.Columns["NHANVIENs"].Visible    = false;
            thanhviendgv.Columns["MATKHAU"].Visible      = false;
            thanhviendgv.Columns["PHANQUYEN"].Visible    = false;
            thanhviendgv.Columns["XUATKHOes"].Visible    = false;
        }
        //xoa user
        private void button36_Click(object sender, EventArgs e)
        {
            NHANVIEN entity = new NHANVIEN();

            entity.MANV      = suatxtidnhanvien.Text;
            entity.TENNV     = suatxtten.Text;
            entity.MATKHAU   = suatxtmatkhau.Text;
            entity.DIACHI    = suatxtdiachi.Text;
            entity.DIENTHOAI = suatxtsdt.Text;


            nhanvienbus bus = new nhanvienbus();

            bool success = bus.delete(entity);

            common.successorerror(success);
            if (success)
            {
                common.ClearTextBoxes(tabPage17);
                thanhviendgv.DataSource = bus.findall(textBox19.Text);
                thanhviendgv.Columns["NHANVIENs"].Visible = false;
            }
        }