I have a GridControl(Devexpress v13) in view(WPF). A **Datatable** set values in ViewModel and assigned to ItemsSource. But ItemsSource filled only initialize. Later Datatable's value changes but it doesn't refresh.
How to ItemsSource refresh?

```
<dxg:GridControl Name="GridControlData" DataSource="{Binding DtCriterias, Mode=TwoWay}" HorizontalAlignment="Left" VerticalAlignment="Top" AutoGenerateColumns="AddNew" Width="400" Height="100">

```

I hope you know what I mean. 
Any help will be much appreciated.

Thanks in advance.

**Edit:**
Property changed using:

```
 public DataTable DtCriterias {
            get { return _dtCriterias; }
            set
            {
                _dtCriterias = value;
                Notify(() => DtCriterias);
            }
        }

protected void Notify(Expression<Func<object>> expression)
        {

            if (_propertyChangedEvent == null) return;

            Notify(GetPropertyName(expression));
        }

protected void Notify(string propertyName)
        {
            if (_propertyChangedEvent != null)
            {
                _propertyChangedEvent(this, new PropertyChangedEventArgs(propertyName));
            }
        }

```