private List<Client> clients;
        public List<Client> Clients { get => clients; set { clients = value; OnPropertyChanged(); } }


        private Client _selectedClient;
        public Client SelectedClient
        {
            get => _selectedClient;
            set
            {
                _selectedClient = value;
                if (!IsEdit) CurrentClient = SelectedClient;
                OnPropertyChanged();
            }
        }

        private Client _currentClient;
        public Client CurrentClient { get => _currentClient; set { _currentClient = value; OnPropertyChanged(); } }

        private bool _isEdit;
        public bool IsEdit { get => _isEdit; set { if (_isEdit && !value) CurrentClient = SelectedClient; _isEdit = value; OnPropertyChanged(); } }

        <StackPanel Margin="10" Grid.Column="1" DataContext="{Binding CurrentClient}">
            <TextBlock Text="ФИО Клиента"/>
            <TextBox Text="{Binding Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
        </StackPanel>

        <StackPanel Margin="10" Grid.Column="1">
            <TextBlock Text="ФИО Клиента"/>
            <TextBox Text="{Binding CurrentClient.Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
        </StackPanel>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <DataGrid ItemsSource="{Binding Clients}" AutoGenerateColumns="False" IsReadOnly="True" SelectedItem="{Binding SelectedClient}">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding ID}" ClipboardContentBinding="{x:Null}" Header="ID" Width="*"/>
                <DataGridTextColumn Binding="{Binding Name}" ClipboardContentBinding="{x:Null}" Header="Фамилия, имя, отчество" Width="6*"/>
            </DataGrid.Columns>
        </DataGrid>
        <StackPanel Margin="10" Grid.Column="1" DataContext="{Binding CurrentClient}">
            <TextBlock Text="ФИО Клиента"/>
            <TextBox Text="{Binding Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" IsEnabled="{Binding DataContext.IsEdit, ElementName=window}"/>
        </StackPanel>
        <Grid Grid.Row="1" Grid.ColumnSpan="2">
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <Button  Margin="10" Content="Редактировать" Command="{Binding EditCommand}" />
            <Button Grid.Column="1" Margin="10" Content="Сохранить изменения" Command="{Binding SaveChangeCommand}" CommandParameter="{Binding CurrentClient}"   IsEnabled="{Binding DataContext.IsEdit, ElementName=window}"/>
            <Button Grid.Column="2" Margin="10" Content="Выйти" Command="{Binding ExitCommand}"   IsEnabled="{Binding DataContext.IsEdit, ElementName=window}"/>
        </Grid>
    </Grid>

    public class ViewModelDSC : OnPropertyChangedClass
    {
        private List<Client> clients;
        public List<Client> Clients { get => clients; set { clients = value; OnPropertyChanged(); } }


        private Client _selectedClient;
        public Client SelectedClient
        {
            get => _selectedClient;
            set
            {
                _selectedClient = value;
                if (!IsEdit) CurrentClient = SelectedClient;
                OnPropertyChanged();
            }
        }

        private Client _currentClient;
        public Client CurrentClient { get => _currentClient; set { _currentClient = value; OnPropertyChanged(); } }

        private bool _isEdit;
        public bool IsEdit { get => _isEdit; set { if (_isEdit && !value) CurrentClient = SelectedClient; _isEdit = value; OnPropertyChanged(); } }


        /// <summary>Поле для хранения значения свойства EditCommand</summary>
        private ICommand _editCommand { get; set; }
        /// <summary>Свойство для привязки команды Редактировать</summary>
        public ICommand EditCommand => _editCommand ?? (_editCommand = new RelayCommand(OnEdit));
        /// <summary>Метод для команды EditCommand</summary>
        protected virtual void OnEdit(object value) { IsEdit = true; CurrentClient = SelectedClient.Copy(); }

        /// <summary>Поле для хранения значения свойства RemoveCommand</summary>
        private ICommand _saveChangeCommand { get; set; }
        /// <summary>Свойство для привязки команды Удалить</summary>
        public ICommand SaveChangeCommand => _saveChangeCommand ?? (_saveChangeCommand = new RelayCommand(OnSaveChange));
        /// <summary>Метод для команды RemoveCommand</summary>
        protected virtual void OnSaveChange(object value)
        {
            MessageBox.Show(value.ToString());
            if (IsEdit && value is Client client)
            {
                if (Model.ChangeID(client))
                {
                    IsEdit = false;
                }
                else
                    System.Windows.MessageBox.Show("Ошибка внесения изменений!");
            }
        }
        /// <summary>Поле для хранения значения свойства EditCommand</summary>
        private ICommand _exitCommand { get; set; }
        /// <summary>Свойство для привязки команды Редактировать</summary>
        public ICommand ExitCommand => _exitCommand ?? (_exitCommand = new RelayCommand(OnExit));
        /// <summary>Метод для команды EditCommand</summary>
        protected virtual void OnExit(object value)
        {
            // Проверка были изменения или нет
            if (IsEdit && !CurrentClient.Equals(SelectedClient))
                // Если были изменения, то вывод предупреждения
                if (MessageBox.Show("Данные не были сохранены!\nПри выходе изменения будут утеряны\nВсё равно выйти?", "Предупреждение!", MessageBoxButton.YesNo)
                     == MessageBoxResult.No)
                    return;
            IsEdit = false;
           
        }


        private ModelDSC _model;

        public ModelDSC Model
        {
            get { return _model; }
            set { _model = value; Clients = Model.GetClients(); }
        }


        public ViewModelDSC() { }
        public ViewModelDSC(string FileName)
        {
            Model = ModelDSC.Load(FileName);
        }
    }