Hello Raghu,

In order to get min and max values for x and y axis, you need to use the following code. Note that there is difference for calculating min/max for x and y axes:

In code-behind:

double xAxisVisibleMinimum = 0, xAxisVisibleMaximum = 0, yAxisVisibleMinimum = 0, yAxisVisibleMaximum = 0;
Rect windowRect = this.DataChart.WindowRect;

NumericYAxis yAxis = ((NumericYAxis)this.DataChart.Axes["numericYAxis"]);
Grid yAxisPlotArea = ((FrameworkElement)yAxis.Parent).Parent as Grid;
if (yAxisPlotArea != null)
{
    Rect viewportRect = new Rect(0, 0, yAxisPlotArea.ActualWidth, yAxisPlotArea.ActualHeight);
    yAxisVisibleMinimum = yAxis.GetUnscaledValue(viewportRect.Bottom, windowRect, viewportRect);
    yAxisVisibleMaximum = yAxis.GetUnscaledValue(viewportRect.Top, windowRect, viewportRect);
}

NumericXAxis xAxis = ((NumericXAxis)this.DataChart.Axes["numericXAxis"]);
Grid xAxisPlotArea = ((FrameworkElement)xAxis.Parent).Parent as Grid;
if (xAxisPlotArea != null)
{
    Rect viewportRect = new Rect(0, 0, xAxisPlotArea.ActualWidth, xAxisPlotArea.ActualHeight);
    xAxisVisibleMinimum = xAxis.GetUnscaledValue(viewportRect.Left, windowRect, viewportRect);
    xAxisVisibleMaximum = xAxis.GetUnscaledValue(viewportRect.Right, windowRect, viewportRect);
}

XAML code used in above code snippet:

    <ig:XamDataChart x:Name="DataChart"  >
            <ig:XamDataChart.Axes>
                <ig:NumericXAxis x:Name="numericXAxis"  >
                    <ig:NumericXAxis.LabelSettings>
                        <ig:AxisLabelSettings Location="OutsideBottom" Extent="40" />
                        </ig:NumericXAxis.LabelSettings>
                </ig:NumericXAxis>
                <ig:NumericYAxis x:Name="numericYAxis" >
                        <ig:NumericYAxis.LabelSettings>
                            <ig:AxisLabelSettings Location="OutsideLeft" Extent="60" />
                        </ig:NumericYAxis.LabelSettings>
                    </ig:NumericYAxis>
            </ig:XamDataChart.Axes>
            <ig:XamDataChart.Series>
                <ig:ScatterSplineSeries XMemberPath="X" 
                                        YMemberPath="Y" 
                                        ItemsSource="{StaticResource Data}" 
                                        XAxis="{Binding ElementName=numericXAxis}" 
                                        YAxis="{Binding ElementName=numericYAxis}" >
                </ig:ScatterSplineSeries>
            </ig:XamDataChart.Series>
        </ig:XamDataChart >

Let me know if you have more questions about it. 

Thank you,

Martin