private void btnCalculatePassword_Click(object sender, RoutedEventArgs e)
 {
     if (!string.IsNullOrEmpty(viewModel.siteName))
     {
         MasterKey masterKey = MasterKey.GetMasterKey();
         seed = masterKey.GetPasswordSeed(viewModel.siteName, viewModel.count);
         viewModel.password = masterKey.GetPassword(seed, (SiteType)viewModel.siteType);
     }
 }