private void btnRetrieveById_Click(object sender, EventArgs e)
 {
     using (CustomerSTEServiceClient proxy = new CustomerSTEServiceClient())
     {
         _customer            = proxy.ReadCustomerUsingSTE(Convert.ToInt32(CustomerId.Text));
         CustomerName.Text    = _customer == null ? String.Empty :_customer.Name;
         CustomerId.Tag       = _customer == null ? null :_customer.Version;
         BillingAddress.Text  = _customer == null ? String.Empty :_customer.BillingAddress.Address;
         BillingCity.Text     = _customer == null ? String.Empty :_customer.BillingAddress.City;
         BillingCountry.Text  = _customer == null ? String.Empty :_customer.BillingAddress.Country;
         BillingZipCode.Text  = _customer == null ? String.Empty :_customer.BillingAddress.ZipCode;
         ShippingAddress.Text = _customer == null ? String.Empty :_customer.ShippingAddress.Address;
         ShippingCity.Text    = _customer == null ? String.Empty :_customer.ShippingAddress.City;
         ShippingCountry.Text = _customer == null ? String.Empty :_customer.ShippingAddress.Country;
         ShippingZipCode.Text = _customer == null ? String.Empty :_customer.ShippingAddress.ZipCode;
         if (_customer == null)
         {
             MessageBox.Show("UserID doesn't exist");
         }
     }
 }