Before we discuss geometry, we need to talk about what you assign geometry to. Basically, you are going to assign geometry to a graphic or a geodatabase feature.
As you can see in the diagram, the GeodatabaseFeature and Graphic classes inherit from the abstract class called Feature. A Feature class has geometry and attributes (fields) and comes from either a feature service (online), Runtime geodatabase (offline), or some other source, such as a shapefile. A graphic can be added to GraphicsLayer or GraphicsOverlay. The big difference between a Graphic and a Feature class is that a Feature class is persisted to FeatureLayer, either in a web service or to disk. A Graphic class is stored in
GraphicsLayer or GraphicsOverlay, but is not persisted. Both the GeodatabaseFeature and Graphic classes can have their geometry set like this:
// Create a new Graphic. Graphic graphic = new Graphic(); // Create a new MapPoint and set it to the Graphics geometry. MapPoint mapPoint = new...