Hi David,
1) Use the following code snippets to set the Value labels on a Chart.
[C#]
//Setting the Value labels on a Chart.
IChartDataLabels labels = serieOne.DataPoints.DefaultDataPoint.DataLabels;
labels.IsValue = true;
Here is the sample for your reference:
Format_datalabel.zip
2) Currently we do not have support to set the position of the data label. I have created a feature request regarding this with our development team.
Please track the status of this feature through the following
http://www.syncfusion.com/support/features/xlsio/Default.aspx?ToDo=view&questId=1349
Please let me know if you have any other questions.
Thanks,
Melba