I want to export polygon Arc list to txt file for that
I created topologygraph for personal geodatabase feature class (polygon) using ITopologyGraph::build.
I got polygon FIDs but I am not getting IDs for individual edges of polygons.
why not just run the gp PolygonToLine tool ? (ArcINFO only)
it takes polygon input, writes out a line feature class with LEFT/RIGHT polygon ID.
The individual edges in a topology based solely on a polygon featureclass don't have ID's. You would need to write out the geometry of the edges to a polyline featureclass, then use their OID's (as suggested by gotchula).