Hello Lokesh,
You can set
RadChart.Series[0].DefaultLabelValue to " " (note the space) in order to remove the data labels. For YAxis item labels rotation you can use
RadChart.PlotArea.YAxis.Appearance.LabelAppearance.RotationAngle.
You can find more details about RadChart elements in
Controls->RadChart->Understanding RadChart Elements chapter in
our online help.
Kind regards,
Ves
the Telerik team