The type or namespace name 'DataSource' could not be found- weka c#

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I am using weka api through c#. I have converted weka jar file to c# dll by using ikvm. Then I have added the converted dll (wekacsharp.dll) in my reference.

I have also added ikvm.gnu.classpath.dll, IKVM.OpenJDK.Core.dll, IKVM.OpenJDK.Util.dll, IKVM.OpenJDK.Text.dll, IKVM.OpenJDK.Core in my reference.

I am trying to use j48 algorithm but i am getting the error. Screen shot of code error is attached. Kindly check it and suggest me something to fix it. Thanks!

            J48 J48_tree = new J48(); //Creating J48 tree instance
            DataSource data_source = new DataSource("iris.arff");         
            Instances data = data_source.getDataSet();        
            if (data.classIndex() == -1)            
                data.setClassIndex(data.numAttributes() - 1);

            J48_tree.buildClassifier(data); // Builds the classifier   

            javax.swing.JFrame j_frame = new javax.swing.JFrame("J48 Tree");

            //final javax.swing.JFrame j_frame = new javax.swing.JFrame("J48 Tree");        
            j_frame.setSize(1200,700);      
            j_frame.getContentPane().setLayout(new BorderLayout());
            TreeVisualizer tree_visualizer = new TreeVisualizer(null, J48_tree.graph(), new PlaceNode2());      
            j_frame.getContentPane().add(tree_visualizer, BorderLayout.CENTER);    

            j_frame.addWindowListener(new java.awt.event.WindowAdapter() {public void windowClosing(java.awt.event.WindowEvent e) {j_frame.dispose(); }});

            j_frame.setVisible(true);
            tree_visualizer.fitToScreen();