Binding TextSymbol.Text to Feature Attribute

[EricJing]

Hi, 

I am using ArcGISRuntime WPF 100.15. I am trying to display text on a FeatureLayer. I want to apply a SimpleRender with TextSymbol to the FeatureLayer. I expect to bind the TextSymbol.Text to a Feature attribute. Can anyone please let me know is it possble? How to make it? 

I want to get the result as the text "CANADA" displayed in the picture below.