You need to assign the ValueFormatting.Format property and set it to ValueFormat.Percentage.
<code>
Chart chart = ( Chart )chartControl1.Charts[ 0 ];
Axis YAxis = ( Axis )chart.Axis( StandardAxis.PrimaryY );
//Setting the Axis
YAxis.ValueFormatting.Format = ValueFormat.Percentage;
LineSeries lineSerie = ( LineSeries )chart.Series.Add( SeriesType.Line );
//Setting the DataLabel
lineSerie.Values.ValueFormatting.Format = ValueFormat.Percentage;
lineSerie.Add( 0.5 );
lineSerie.Add( 0.35 );
lineSerie.Add( 0.43 );
lineSerie.Add( 0.47 );
lineSerie.Add( 0.79 );
</code>
Imported from legacy forums. Posted by CharlesB (had 185 views)