void RegisterClickHandler(object sender, EventArgs e)
 {
     var user = new User ();
     var registerPage = new UserPage (true);
     registerPage.BindingContext = user;
     Navigation.PushAsync (registerPage);
 }
 void LoginClickHandler(object sender, EventArgs e)
 {
     var user = new User ();
     var page = new LoginPage ();
     page.BindingContext = user;
     Navigation.PopAsync ();
     Navigation.PushAsync (page);
 }
 public Task SaveUserAsync(User item, bool isNewItem = false)
 {
     return soapService.SaveUserAsync (item, isNewItem);
 }
 public User GetValidUser(User user)
 {
     return soapService.GetValidUserAsync(user);
 }
 public Task DeleteUserAsync(User item)
 {
     return soapService.DeleteUserAsync (item.ID);
 }