public EditOperation()

// Creates new features in a feature layer using the specified geometry, attributes, or editing template.
await QueuedTask.Run(() =>
{
  var createFeatures = new EditOperation() { Name = "Create Features" };
  //Create a feature with a polygon
  var token = createFeatures.Create(featureLayer, polygon);
  if (createFeatures.IsSucceeded)
  {
    // token.ObjectID will be populated with the objectID of the created feature after Execute has been successful
  }
  //Do a create features and set attributes
  var attributes = new Dictionary<string, object>
{
  { "SHAPE", polygon },
  { "NAME", "Corner Market" },
  { "SIZE", 1200.5 },
  { "DESCRIPTION", "Corner Market" }
};
  createFeatures.Create(featureLayer, attributes);

  //Create features using the current template
  //Must be within a MapTool
  createFeatures.Create(currentTemplate, polygon);

  //Execute to execute the operation
  //Must be called within QueuedTask.Run

  if (!createFeatures.IsEmpty)
  {
    //Execute will return true if the operation was successful and false if not.
    createFeatures.Execute();
    //or use async flavor
    //await createFeatures.ExecuteAsync();
  }
});