async void SaveUser() { if (Password == RepeatedPassword) { AesCrypto cryptModul = new AesCrypto(); User[] prihlas; try { prihlas = _context.Users.Where(b => b.Login == Username).ToArray(); } catch (Exception e) { throw e; } bool empty = false; try { if (prihlas[0].Login == Username) { empty = true; } } catch (Exception e) { //throw e; } //System.Diagnostics.Debug.WriteLine("prihlas " + prihlas[1].Login); if (empty) { UserDialogs.Instance.Alert("Login", "Obsadené meno", "OK"); prihlas = null; } else { byte[] kluc = cryptModul.GetKey(); string klucik = Convert.ToBase64String(kluc); byte[] klucIV = cryptModul.GetIV(); string klucikIV = Convert.ToBase64String(klucIV); User user = new User { Login = Username, Password = Password, Key = klucik, IV = klucikIV, }; _context.Users.Add(user); try { _context.SaveChanges(); } catch (Exception e) { throw e; } UserDialogs.Instance.Alert("Úspešná registrácia", "Registrácia", "OK"); await Application.Current.MainPage.Navigation.PopAsync(); } } else { UserDialogs.Instance.Alert("Heslo sa nezhoduje", "Chyba", "OK"); } }