I want to display information for each point on my linechart that is not in the datatable that's being used as the datasource. Can you tell me how to do that?
You can try using:
this.ultraChart1.Tooltips.Format = TooltipStyle.LabelPlusDataValue;
Also you can specify custom formatting:
this.ultraChart1.Tooltips.FormatString = "Line point: <ITEM_LABEL>";
More about label formatting you can find here:
http://help.infragistics.com/Help/NetAdvantage/NET/2008.1/CLR2.0/html/Chart_Label_Formatting.html