AutoCAD DLL Automation using C# – Complete Step-by-Step Tutorial
Learn how to build a professional AutoCAD plugin using the .NET API.
This is a full-length, highly detailed tutorial designed for engineers, CAD developers, and automation beginners.
⭐ What You’ll Learn
✔ How to create an AutoCAD DLL plugin from scratch
✔ Setting up a Class Library (.NET Framework 4.8)
✔ Adding AutoCAD API references (acmgd, acdbmgd, accoremgd)
✔ What each reference does and why it’s required
✔ How AutoCAD’s internal database works
✔ Transaction Manager explained
✔ BlockTable & BlockTableRecord structure
✔ Creating lines, blocks, and block references
✔ Understanding Commit() vs non-commit behaviour
✔ Debugging, troubleshooting & best practices
✔ Step-by-step live coding in C#
📘 Download the Full PDF Reference Document
The complete detailed explanation (40+ minutes of content) is available as a PDF for your future reference.
Download it here:
drive.google.com/file/d/1cwiTZWhClR228gCgSx3uKPjkIac_RUor/view?usp=sharing
⏱️ Chapters
Introduction
Visual Studio setup
Adding AutoCAD references
Understanding accoremgd / acmgd / acdbmgd
What is a Transaction
Creating a Line entity
BlockTable & BlockTableRecord deep dive
Creating Blocks & BlockReferences
Debugging tips
Final summary
All commands shown in the video are fully explained, step-by-step.
👍 If You're Learning CAD Automation
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NX Open
Fusion 360 Python API
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