ColumnSeries binding data with WPF Toolkit exception

Question

I'm using WPF Toolkit extension to show a Column Graph that takes the data from a Dictionary<string,ulong> (where the strings are the X-values and the ulong the Y ones). This is the declaration of the XAML

<chartingToolkit:Chart x:Name="Chart" HorizontalAlignment="Left" Margin="10,10,0,0" Title="Chart Title" VerticalAlignment="Top" Height="560" Width="1000">
    <chartingToolkit:ColumnSeries x:Name="myGraph" DependentValuePath="Key" IndependentValuePath="Value" ItemsSource="{Binding}"/>
</chartingToolkit:Chart>

And I have an object that construct a Dictionary <string,ulong>

so, I declared the global variable

private Dictionary<string,ulong> myDictionary;

to store the data from my object and bind it with the chart as follows

this.myDictionary = myObject.objectDictionary;
myGraph.Title = "My Title";
myGraph.ItemsSource = this.myDictionary;

But I get the following exception:

Object reference not set to an instance of an object.

So, is there I'm doing wrong with the binding?

Regards

Answer 1

Ok, I found the error on my program. Instead of using ItemsSource , I used myGraph.DataContext defining the IndependentValuePath and DependentValuePath properly.

this.myDictionary = myObject.objectDictionary;
myGraph.DataContext = this.myDictionary;
myGraph.IndependentValuePath = "Key";
myGraph.DependentValuePath = "Value";