using NetTopologySuite.Geometries; // Create an array of coordinate points Coordinate[] coords = { new Coordinate(0,0), new Coordinate(0,10), new Coordinate(10,10), new Coordinate(0,0) }; // Instantiate a new geometry factory object IGeometryFactory factory = new GeometryFactory(); // Create a new polygon using the coordinate points and factory object Polygon polygon = factory.CreatePolygon(coords);In this example, we create an array of coordinate points that define the vertices of the polygon. We then instantiate a new IGeometryFactory object and use the CreatePolygon method to create a new polygon object. This code example demonstrates the use of the NetTopologySuite library for C# and the IGeometryFactory interface.