public ElevationSurfaceLayer SurfaceLayer {get; set;}

if (!MapView.Active.CanShowElevationProfileGraph())
  return;

// find a specific elevation surface layer
var eleLayer = MapView.Active.Map.GetElevationSurfaceLayers().FirstOrDefault(l => l.Name == "TIN");

// set up the parameters
var profileParams = new ElevationProfileParameters();
profileParams.SurfaceLayer = eleLayer;
profileParams.Densify = true;


// show the elevation profile for a polyline using the params
MapView.Active.ShowElevationProfileGraph([lineGeom], profileParams);

// show the elevation profile for a set of points using the params
MapView.Active.ShowElevationProfileGraph(pts, profileParams);

int numPoints = 20;

if (!MapView.Active.CanShowElevationProfileGraph())
  return;

// show the elevation profile 
// use the default ground elevation surface
MapView.Active.ShowElevationProfileGraph(startPt, endPt, numPoints);

// find a specific elevation surface layer
var tinLayer = MapView.Active.Map.GetElevationSurfaceLayers().FirstOrDefault(l => l.Name == "TIN");

// set up the params
var elevProfileParams = new ElevationProfileParameters();
elevProfileParams.SurfaceLayer = tinLayer;
elevProfileParams.Densify = false;

// show the elevation profile using the params
MapView.Active.ShowElevationProfileGraph(startPt, endPt, numPoints, elevProfileParams);