public sealed class ActiveTemplateChangedEventArgs : System.EventArgs 

// Subscribes to the active template changed event and handles changes to the editing template.
ArcGIS.Desktop.Editing.Events.ActiveTemplateChangedEvent.Subscribe(async activeTemplateChangedEventArgs
  =>
{
  // return if incoming template is null
  if (activeTemplateChangedEventArgs.IncomingTemplate == null)
    return;

  // Activate two-point line tool for Freeway template in the Layers map
  if (activeTemplateChangedEventArgs.IncomingTemplate.Name == "Freeway" && activeTemplateChangedEventArgs.IncomingMapView.Map.Name == "Layers")
    await activeTemplateChangedEventArgs.IncomingTemplate.ActivateToolAsync("esri_editing_SketchTwoPointLineTool");
});