Data binding in wpf in mvvm pattern

I would suggest using an observable property in your Viewmodel:

private CollectionView _comboBoxOptions = null;
        public CollectionView comboBoxOptions
        {
            get { return _comboBoxOptions; }
            set
            {
                if (_comboBoxOptions != value)
                {
                    _comboBoxOptions = value;
                    RaisePropertyChanged("comboBoxOptions");
                }
            }
        }

You would also have to use INotifyPropertyChanged in the Viewmodel:

public event PropertyChangedEventHandler PropertyChanged;
        protected void RaisePropertyChanged(string name)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null) handler(this, new PropertyChangedEventArgs(name));
        }

Then in your XAML bind your control to that property :

<ComboBox>
   <Binding Path="comboBoxOptions"
   ValidatesOnDataErrors="True"
   NotifyOnValidationError="True"
   Mode="OneWay"
   UpdateSourceTrigger="LostFocus"/>
</ComboBox>

You could initialise the comboBoxOptions property in the constructor for your Viewmodel.

Hope this helps

Laurence

Hello
have a look on this code, it may help you.

public class Order
{
    private readonly string _instrument;
    private readonly double _price;
    private readonly long _quantity;

    public Order(string instrument, double price, long quantity)
    {
        _instrument = instrument;
        _price = price;
        _quantity = quantity;
    }

    public string Instrument
    {
        get { return _instrument; }
    }

    public double Price
    {
        get { return _price; }
    }

    public long Quantity
    {
        get { return _quantity; }
    }
}

public void PopulateGrid(Grid grid)
{
    BindingList<order> orders = new BindingList<order>();

    orders.Add(new Order("Instrument1", 10.55, 34));
    orders.Add(new Order("Instrument2", 12.26, 154));
    orders.Add(new Order("Instrument1", 13.16, 14));
    orders.Add(new Order("Instrument5", 9.85, 52));
    orders.Add(new Order("Instrument1", 16.47, 11));

    grid.DataSource = orders;
}
</order></order>

more can be found here http://www.dapfor.com/en/net-suite/net-grid/features/hierarchical-data-binding[^]

Try following

class YourWindowViewModel
    {
        public CollectionView comboBoxItems { get; private set; }
 
        public YourWindowViewModel()
        {
            
            List<yourclassname> listItems = new List<yourclassname>();
            YourComboBoxname.ItemsSource=listItems ;
         
        }
      
    }
</yourclassname></yourclassname>

Here is your xaml code

<combobox>
   SelectedItem = "{Binding YourPropertyName}"
   DisplayMemberPath="{Binding YourPropertyName}"
   />
</combobox>