How to start using the Civil 3D API with C#?

[alexander_07_11]

Hi everyone. I post here cause I don't know how to start learning to use the C3D API to create commands. I'm not new to programming, as I've used Python and also I'm capable in Dynamo for C3D, but I know that the C3D API is a lot more powerful. I hope you can guide me or recommend where can I learn or how to start. Wish I'm not breaking any rules posting this here. Thanks in advance.

[hosneyalaa · Accepted solution]

@alexander_07_11 

To create a new project that uses the Autodesk Civil 3D managed classes in Microsoft Visual Studio

https://help.autodesk.com/view/CIV3D/2025/ENU/?guid=GUID-DE3A46DA-508E-43A0-8538-C77D978D06B2

[essam-salah · Accepted solution]

---

@alexander_07_11 wrote:

I hope you can guide me or recommend where can I learn or how to start. Wish I'm not breaking any rules posting this here. Thanks in advance.

---

hi, as @hosneyalaa  mentioned the C3D documentation is the best way to start with, first just try all examples in documentaions and try to tweek it and play arround with it , then try to solve your own problem, and if get stuck you can post here.

good luck

[Jeff_M · Accepted solution]

There are a few sample projects that are installed with Civil 3D:

C:\Program Files\Autodesk\AutoCAD 2024\C3D\Sample\Civil 3D API\DotNet\CSharp

[alexander_07_11]

Thank you very much for your responses. I'm starting out using the sample project that comes with C3D. I hope I can make it. Thanks again