Rotate line by C#

I had trouble using this method
Glad to help.
I want to rotate a line

rorate.gh (5.8 KB)

private void RunScript(Point3d pt, Line line, ref object A)
{
  line.Transform(Transform.Rotation(Math.PI*0.5, pt));
  A = line;
}

Rotation.gh (2.3 KB)

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