Wpf data visualisation

I'm using data 开发者_运维知识库visualisation libary and I want to do something like in the attached image:

two kinds of bars one on each other, How can I do that ?

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Visiblox Charts offers a MultiValueSeriesBase in their free version. Extending this should be able to implement something like your chart above.

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Dynamic Data Display is a free library for WPF on CodePlex which can do graphing.

Infragistics offers a WPF Data Visualization library. xamChart would do what you're looking for. Currently it's $995 without support.