GMGobi M Syncfusion Team May 10, 2016 12:00 PM UTC
Thanks for contacting Syncfusion support.
We are able to achieve your requirement Line with average in ColumnSeries by adding a new Line series at the average YBindingPath value of Column series. We have prepared a sample and it is available for download in below location. In this sample, we have added new Line series with Numerical XAxis which axis visibility is hidden.