Autodesk Fabrication CADmep is in C#.  There is also a scripting language that can be used if modeling within AutoCAD.  If your in Revit then you can use either C# or visual basic.

Nathan Chapman
Production Manager at General Heating and Air Conditioning

Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author

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