public ElevationProfileGraph GetElevationProfileGraph()

public void ElevationProfileGraphAdded()
{

  var mv = MapView.Active;
  // subscribe to the Added, Removed events for the elevation profile graph
  mv.ElevationProfileGraphAdded += Mv_ElevationProfileGraphAdded;
  mv.ElevationProfileGraphRemoved += Mv_ElevationProfileGraphRemoved;

}

private void Mv_ElevationProfileGraphRemoved(object sender, EventArgs e)
{
  ;
}

private void Mv_ElevationProfileGraphAdded(object sender, EventArgs e)
{
  // get the elevation profile graph from the view
  // this will be non-null since we are in a ElevationProfileGraphAdded handler
  var mv = MapView.Active;
  var graph = mv.GetElevationProfileGraph();

  // subscribe to the ContentLoaded event
  graph.ContentLoaded += Graph_ContentLoaded;
}

private void Graph_ContentLoaded(object sender, EventArgs e)
{
  // get the elevation profile graph
  var graph = sender as ArcGIS.Desktop.Mapping.ElevationProfileGraph;

  // get the elevation profile geometry
  var polyline = graph.Geometry;
  // get the elevation profile statistics
  var stats = graph.ElevationProfileStatistics;
}

var elevProfileGraph = MapView.Active.GetElevationProfileGraph();
// Elevation profile graph will be null if no profile graph is displayed
if (elevProfileGraph == null)
  return;

// get the elevation profile geometry and stats
var polyline = elevProfileGraph.Geometry;
var stats = elevProfileGraph.ElevationProfileStatistics;

// reverse the graph
elevProfileGraph.IsReversed = !elevProfileGraph.IsReversed;

// collapse the graph
elevProfileGraph.IsExpanded = false;

var elevProfileGraph = MapView.Active.GetElevationProfileGraph();
// Elevation profile graph will be null if no profile graph is displayed
if (elevProfileGraph == null)
  return;

if (elevProfileGraph.CanExport)
{
  elevProfileGraph.ExportToImage("c:\\temp\\myprofileImage.png");
  elevProfileGraph.ExportToCSV("c:\\temp\\myprofile.csv");
}