C# - closed Polyline length

[RoSiNiNo]

Hallo,
how do i get the length of a closed polyline?
I've tried to get the length with

CurveObj.GetDistAtPoint(CurveObj.EndPoint)
But the length will be 0.

[jwanstaett]

try some thing like

CurveObj.getDistAtParam(CurveObj.getEndParam)