Here is some code to write the labels vertically and centered:
<code>
Chart m_chart = ChartServerControl1.Charts[ 0 ];
BarSeries m_bar = ( BarSeries )m_chart.Series.Add( SeriesType.Bar );
m_bar.Values.FillRandomRange( 5, 20, 100 );
m_bar.DataLabels.VertAlign = Xceed.Chart.GraphicsCore.VertAlign.Center;
m_bar.DataLabels.ArrowLength = 0;
m_bar.DataLabels.Text.Orientation = 90;
</code>
Charles Bérubé-Rémillard
Technical Support
Xceed Software Inc.