protected async void BtnSave_Click(object sender, EventArgs e)
        {
            var newUnit = new ProductUnitViewModel
            {
                Name        = txtName.Text,
                Description = txtDescription.Text
            };

            HttpClient client = new HttpClient();
            var        x      = await client.GetAsync("https://localhost:44313/api/Login/4");


            var valid = manager.Validatation(new UnitValidator(unitsList, newUnit));

            if (valid != string.Empty)
            {
                return;
            }
            manager.CreateAndSave(newUnit);
        }