Hello Arun Kumar,
Thanks for contacting us.
Changing the labels background is not supported out of the box. In order to achieve that, additional retemplating needs to be done.
I've attached a sample project that you could refer to and see how I did it.
If you simply want to change the labels' foreground only, it can be done easily by creating a new style like this:
<Style x:Key="LabelForeground" TargetType="TextBlock">
<Setter Property="Foreground" Value="Red" />
and then show in your code behind what style should be used:
lineChart.DefaultView.ChartArea.AxisX.AxisStyles.ItemLabelStyle = this.Resources["ItemLabelStyle"] as Style;
In case you haven't visited our Styes and Templates help topics, they can be found here
the Telerik team
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