Revit API Beam builder

I am a Revit Plugins developer,

For my app I need a C# "beam builder" object.

With the following method:

public static void ByLineAndReferencePlane

Input:
Docoment doc(if needed)

ReferencePlane rp

Line line

Symbol beamSymbol

Any other Documentation needed

Output:

Create a beam according to (x,y) coordinates of a line
On Top a reference plane.

Must be available and tested for sloped reference planes.