Lindsay said:

1)How to use this control in Winform Application,i cann't able to add this control from rt.click toolbox and selecting choose item menu?

since the XamChart is a WPF control and not a Windows Forms control, trying to use it in a WinForms app is a little complicated: http://msdn.microsoft.com/en-us/library/ms742215.aspx

note that we also have a Windows Forms chart control available.

Lindsay said:

2)How to use DrillDown functionality with this control?Please provide some sample application.

there is no special mechanism for drilldown, it is simply a matter of handling one of the click events (this can be on the series, chart control, or datapoint) and applying whatever changes you want at that time.  in most drilldown scenarios, this will involve changing the datasource.  the code will look something like this:

        private void XamChart_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            XamChart theChart = (XamChart)sender;
            HitTestArgs hit = theChart.HitTest(e);
            switch (hit.PointIndex)
            {
                case 0:
                    theChart.Series.Clear();
                    theChart.Series.Add(this.GetSeries());
                    break;
                case 1:
                    theChart.Series.Clear();
                    theChart.Series.Add(this.GetSeries());
                    break;
                case 2:
                    theChart.Series.Clear();
                    theChart.Series.Add(this.GetSeries());
                    break;
            }
        }