ChartBindings bindings = new ChartBindings();
bindings.ItemNameBinding = new Binding("Name");
bindings.SeriesBindings.Add(new Binding("Input"));
bindings.SeriesBindings.Add(new Binding("Output"));

chart.Bindings = bindings;
chart.DataContext = new InOut[]
{
    new InOut() { Name = "n1", Input = 90, Output = 110},
    new InOut() { Name = "n2", Input = 80, Output = 70},
    new InOut() { Name = "n3", Input = 100, Output = 100},
};

where InOut is defined as:
     
public class InOut
{
    public string Name { get; set; }
    public double Input{ get; set;}
    public double Output { get; set; }
}