I'm trying to convert my VB.NET code from TAO to OpenTK, so far so good except for this line:

Public sphere As Tao.OpenGl.Glu.GLUquadric = New Tao.OpenGl.Glu.GLUquadric


I have tried repleacing Tao.opengl with Opentk.Graphics and Opentk.Graphics.OpenGL but neither worked.

David