Error in making Polylinecurve

Hello..... 

I need help ...please.

I tried two methods to make Polylinecurve but failed...

1.

Dim p0 As New Point3d(0, 0, 0)         

Dim p1 As New Point3d(0, 0, 100)

Dim p2 As New Point3d(0, 100, 100)

Dim temPolyCrv As New PolylineCurve() ==> failed here.

temPolyCrv.SetStartPoint(p0)

temPolyCrv.SetPoint(1, p1)

2.

Dim pts As New List(Of Point3d) 

Dim p0 As New Point3d(0, 0, 0)         

Dim p1 As New Point3d(0, 0, 100)         

Dim p2 As New Point3d(0, 100, 100)

pts.add(p0)

pts.add(p1)

pts.add(p2)

Dim temPolyCrv As New PolylineCurve(pts)  ==> failed here.

And My visual Studio Error Message is,

" Dll Not Found Exception...."

But 

RhinoCommon dll is in the referece list correctly

and I tried both "local copy" true, and false...

hm.....