This .NET class wraps the AcDb::Poly2dType ObjectARX enum.

Public Enum Poly2dType
  SimplePoly
  FitCurvePoly
  QuadSplinePoly
  CubicSplinePoly
End Enum

public enum Poly2dType {
  SimplePoly,
  FitCurvePoly,
  QuadSplinePoly,
  CubicSplinePoly
}