How to show XY data from some data Table?

Discussion created by aviabunin on Mar 14, 2011
c#+.Net+arcgis Engine
I have data table with X,Y coordinates. It's easy to show XY data in arcgis desctop.
But if I export data in shape file and add them as layer it's not clear how to manage changing data.
So 2 questions:
1. How to add new data to the layer?
2. How to show XY data in real time?
3. How to show results of query with XY fields?
Thanks for any reference!