public PhonebookRepository(PhonebookContext ctx)
 {
     this._ctx = ctx;
 }
 public PhonebookSeeder(PhonebookContext phonebookContext, IHostingEnvironment hosting, UserManager <IdentityUser> userManager)
 {
     this._ctx         = phonebookContext;
     this._hosting     = hosting;
     this._userManager = userManager;
 }