Extrusion and difference

Hi
I managed to get the rhinocommons working and can now do some stuff from c#. But can’t get the most important functions to work:

1. I want to extrude a shape along a curve.

2. The end points of the curve should be on the surface of an object I click (my is click always return the coordinates on the XY plane).

3. I want to make boolean differences of the objects I create. Do the objects have to be meshed (Brep?) to do this?

At the moment I just make the objects like below:

            Rhino.Geometry.Line line1 = new Line(pt1, pt2);
        doc.Objects.AddLine(line1);

        Rhino.Geometry.Curve curve1 = Curve.CreateArcBlend(
            pt1, new Vector3d(1, 1, 0),
            pt2, new Vector3d(0, 2, 0),
            1);
        doc.Objects.AddCurve(curve1);

        Extrusion extrusion = Extrusion.Create(curve1, 5, true);
        doc.Objects.AddExtrusion(extrusion);

        Cylinder cylExt = new Cylinder(new Circle(new Point3d(0, 0, 0), 0.3), 20);
        Extrusion extrusion = Extrusion.CreateCylinderExtrusion(cylExt, true, true);
        doc.Objects.AddExtrusion(extrusion);

        doc.Views.Redraw();

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