private async void btnSave_Click(object sender, RoutedEventArgs e)
        {
            LicenseDetailDto license = new LicenseDetailDto
            {
                SoftwareId = SoftwareId,
                Edition = txtEdition.Text,
                ActivationKey = txtActivationKey.Text,
                VolumeLicense = false
            };

            bool? success;
            using (var client = new LicensesClient())
            {
                success = await client.PostLicense(license);
            }
            if (success == null)
            {
                throw new NotImplementedException();
            }
            if (!success.HasValue) { throw new NotImplementedException(); }
            if (!success.Value) { throw new NotImplementedException(); }
            this.Close();
        }
 public async Task<bool> PutLicense(int id, LicenseDetailDto license)
 {
     throw new NotImplementedException();
 }