You can specify the font family, size and style of the XAxis labels like this:
, 24F, FontStyle.Italic)
Additionally you can set the font color like this:
RadChart1.PlotArea.XAxis.Appearance.TextAppearance.TextProperties.Color = Color.Red
I hope this helps.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed