Hi ​@Jhon 

Lucidchart does not natively generate UML diagrams directly from C# project code. It is primarily a visual diagramming tool designed for manual or collaborative creation of UML and other technical diagrams.

My team uses external tools to analyze our C# project and generate UML (e.g., class diagrams) in a compatible format, such as Visual Studio UML tools. We then export the diagrams as an image, SVG or PDF and upload to Lucidchart. The structure can also be manually recreated in Lucidchart using the UML shape libraries for collaboration and further styling. 

Please let me know if this helps!

Hi ​@Jhon 

You can also leverage external reverse engineering tools to extract UML diagrams from your existing codebase. Once extracted, you can import these diagrams into Lucidchart, where you can visualize and based on your need.

To learn more - How To Reverse Engineer UML Activity Diagram from code? (specifically APEX) | Community

Hope this helps - Happy to help further!!
Thank you very much and have a great one!
Warm regards