.NET (Core and Framework)

public class Busta
   {

       public string _nomeCliente;
       [Key]
       [Required]
       public int BustaID { get; set; }
       public int NegozioID { get; set; }
       [StringLength(20)]
       public string NomeCliente { get; set; }

       public virtual Negozio Negozio { get; set; }


   }

public class Negozio
    {
        public int NegozioID { get; set; }
        public string RagioneSociale { get; set; }

        public virtual List<Busta> Bustas { get; set; }
    }

$stringToHash = "10123456789"."2014:11:25-15:42:00"."20.00"."826"."sharedsecret";

echo($stringToHash);
// outputs:
// 101234567892014:11:25-15:42:0020.00826sharedsecret

$ascii = bin2hex($stringToHash);

echo($ascii);
// outputs:   
// 3130313233343536373839323031343a31313a32352d31353a34323a303032302e3030383236736861726564736563726574

$sha = sha1($ascii);

echo($sha);
// outputs:
// 847aa9da32c54ed8bb9183007336f5762a62ef20

var stringToHash = "10123456789" + "2014:11:25-15:42:00" + "20.00" + "826" + "sharedsecret";

Console.WriteLine(stringToHash);
// outputs:
// 101234567892014:11:25-15:42:0020.00826sharedsecret

var bytes = Encoding.ASCII.GetBytes(stringToHash);

var hexString = BitConverter.ToString(bytes).Replace("-", string.Empty);

Console.WriteLine(hexString);
// outputs:
// 3130313233343536373839323031343A31313A32352D31353A34323A303032302E3030383236736861726564736563726574

SHA1 sha = new SHA1CryptoServiceProvider();
var password = sha.ComputeHash(bytes);
var result = BitConverter.ToString(password).ToLower().Replace("-", string.Empty);

Console.WriteLine(result);
// outputs:
// c8069048623d6b98a08454e43e1a02a42cf7d61d

var hexStringBytes = Encoding.ASCII.GetBytes(hexString);
var hexStringPassword = sha.ComputeHash(hexStringBytes);
var hexStringResult = BitConverter.ToString(hexStringPassword).ToLower().Replace("-", string.Empty);

Console.WriteLine(hexStringResult);
// outputs:
// bd857ca08446001f7182fbbbd41e747abe302a87

<pre lang="c#">
public class MainViewModel : ViewModelBase
    {
        /// <summary>
        /// Initializes a new instance of the MainViewModel class.
        /// </summary>
        /// 
         IDataAccessService _serviceProxy;

         ObservableCollection<Busta> _Bustas;

         public ObservableCollection<Busta> BustaOservable
         {
             get { return _Bustas; }
             set
             {
                 _Bustas = value;
                 RaisePropertyChanged("BustaOservable");
             }
         }

         ObservableCollection<Negozio> _Negozios;

         public ObservableCollection<Negozio> NegozioObser

         {
             get { return _Negozios; }
             set
             {
                 _Negozios = value;
                 RaisePropertyChanged("Negozio");
             }
         }

        Busta _Busta;
        public Busta Busta
        {
            get { return _Busta; }
            set
            {
                _Busta = value;
                RaisePropertyChanged("Busta");
            }
        }

        Negozio _Negozio;
        public Negozio NegozioSelezionato
        {
            get { return _Negozio; }
            set
            {
                _Negozio = value;
                RaisePropertyChanged("NegozioSelezionato");
            }
        }

        #region Command Object Declarations
       
        public RelayCommand<Busta> SaveCommand { get; set; }

        

       
        #endregion
        public MainViewModel(IDataAccessService servPxy)
        {
            _serviceProxy = servPxy;
            Busta = new Busta();
            NegozioSelezionato = new Negozio();
             
            SaveCommand = new RelayCommand<Busta>(SalvaBusta);
            NegozioObser = new ObservableCollection<Negozio>();
            
        }
//Metodo Per Salvare La Busta
 void SalvaBusta(Busta Bus)
{
    Bus.NegozioID = NegozioSelezionato.NegozioID;
    Busta.BustaID = _serviceProxy.CreateBusta(Bus);
    if (Busta.BustaID != 0)
    {
        BustaOservable.Add(Busta);
        RaisePropertyChanged("Busta");
    }

       
        }
//Metodo Per Caricare I dati Della Combobox
 public void GetNegozio()
 {
     
     foreach (var item in _serviceProxy.GetNegozio())
     {
         NegozioObser.Add(item);
     }
 }
    }
}

<pre lang="HTML"><Window x:Class="Prova1.View.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        DataContext="{Binding Main,Source={StaticResource Locator}}"
        Title="MainWindow" Height="429" Width="615" Loaded="Window_Loaded">


    <Grid>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="327,85,0,0" TextWrapping="Wrap" Text="{Binding Busta.BustaID, Mode=TwoWay }" VerticalAlignment="Top" Width="120"/>
        <Label Content="BustaID" HorizontalAlignment="Left" Margin="238,85,0,0" VerticalAlignment="Top"/>
        <Label Content="NegozioId" HorizontalAlignment="Left" Margin="238,116,0,0" VerticalAlignment="Top"/>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="327,142,0,0" TextWrapping="Wrap" Text="{Binding Busta.NomeCliente, Mode=TwoWay}" VerticalAlignment="Top" Width="120"/>
        <Label Content="NomeCliente" HorizontalAlignment="Left" Margin="238,142,0,0" VerticalAlignment="Top"/>
        <Button Content="Salva" HorizontalAlignment="Left" Margin="215,233,0,0" VerticalAlignment="Top" Width="75"
                Command="{Binding SaveCommand}" CommandParameter="{Binding Busta}"/>
       <!-- <TextBox HorizontalAlignment="Left" Height="23" Margin="327,114,0,0" TextWrapping="Wrap" Text="{Binding Busta.NegozioID, Mode=TwoWay}" VerticalAlignment="Top" Width="120"/>-->
        <ComboBox HorizontalAlignment="Left" Margin="327,116,0,0" VerticalAlignment="Top" Width="120" ItemsSource="{Binding NegozioObser}" SelectedItem="{Binding NegozioSelezionato}">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <Grid>
                        <TextBlock Text="{Binding RagioneSociale}"></TextBlock>
                    </Grid>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox> 
    </Grid>

</Window>

System.NullReferenceException verificata
  HResult=-2147467261
  Message=Riferimento a un oggetto non impostato su un'istanza di oggetto.
  Source=Prova1
  StackTrace:
       in Prova1.ViewModel.MainViewModel.SalvaBusta(Busta Bus) in k:\c#\MVVMLight\Prova1\Prova1\ViewModel\MainViewModel.cs:riga 102
  InnerException: