You think Creating Circuler Graph is a difficult task ...........!!!

Not difficult as much as I thogh, to create circular graphs
 /*
//User can use this method to rtive data from DB 
  string q9 = "select DISTINCT testcode from soilfinalcal order by testcode";
            DataSet st1 = MVCAController.db_access.SelectData(q9);

            if (st1 != null)
            {
                cmbCircleGraph.DataSource = st1.Tables[0];
                cmbCircleGraph.ValueMember = "testcode";
                cmbCircleGraph.DisplayMember = "testcode";
                cmbCircleGraph.Text = "";
            }
            else
                cmbCircleGraph.DataSource = null;
*/

        double[] xax = new double[180];
        double[] yax = new double[180];

        double radius = 77.24;
        double x = 177.24;
        double y = 0;

        double[] xax1 = new double[180];
        double[] yax1 = new double[180];

        double radius1 = 111.17;
        double x1 = 261.17;
        double y1 = 0;

        double[] xax2 = new double[180];
        double[] yax2 = new double[180];

        double radius2 = 87.66;
        double x2 = 287.66;
        double y2 = 0;
            for (int i = 0; i < 180; i++)
            {
                xax[i] = x + radius * Math.Cos(i * Math.PI / 180);
                yax[i] = y + radius * Math.Sin(i * Math.PI / 180);

                xax1[i] = x1 + radius1 * Math.Cos(i * Math.PI / 180);
                yax1[i] = y1 + radius1 * Math.Sin(i * Math.PI / 180);

                xax2[i] = x2 + radius2 * Math.Cos(i * Math.PI / 180);
                yax2[i] = y2 + radius2 * Math.Sin(i * Math.PI / 180);
            }

            Soilgrapcircle1.Series["Series1"].Points.DataBindXY(xax, yax);
            Soilgrapcircle1.Series["Series2"].Points.DataBindXY(xax1, yax1);
            Soilgrapcircle1.Series["Series3"].Points.DataBindXY(xax2, yax2);


code above  can generate below graph. You can change variable values and modify the graphs.