Mastering ChatGPT and OpenAI APIs with C#

Build Generative AI-powered Blazor Web Apps—using both HttpClient and OpenAI's official .NET Library

Learn how to connect your C# applications to OpenAI's ChatGPT—build real-world Blazor Web Apps using raw HTTP and the official .NET SDK. No Python needed!

Are you a C# developer eager to explore the exciting world of Generative AI but feel left behind in the Python-centric ecosystem?

This course is made just for you.

In this hands-on course, you'll learn how to connect your C# applications to OpenAI's ChatGPT API and build fully functional Blazor Web Apps powered by Generative AI. Whether you prefer using HttpClient to make raw RESTful API calls or want to leverage the official OpenAI .NET Library, this course covers both approaches in detail.

What makes this course special:

• No need to switch to Python—learn how to build GenAI apps entirely with C#

• Step-by-step guidance on setting up your OpenAI account, API key, and environment

• Build interactive web applications using .NET 8 and Blazor

• Deep dive into the Chat Completion API, including parameter configuration and streaming mode

• Real project walkthroughs with clear, beginner-friendly explanations

• Learn how to enrich GPT's capabilities by enabling it to trigger your own custom C# functions using the Tool Call mechanism.

What will you learn?

The following lists the main topics of this course:

1. A GPT course for C# developers – A brief introduction to the course and your instructor.

2. Intro to GPT, ChatGPT, and OpenAI API – Understand the evolution of ChatGPT and the different types of APIs available.

3. Preparing the prerequisites – Learn how to set up an OpenAI account, create a payment method, and generate an API key.

4. Quick Start – Use ChatGPT with C# to build your first Blazor Server App that accesses the OpenAI API.

5. Chat Completion API – Understand required parameters and improve the UI/UX of the Blazor app created earlier.

6. Streaming Mode – Learn how to receive chat completion chunks by enabling streaming in the API.

7. OpenAI .NET Library - Chat Completion API – Learn how to install the official OpenAI .NET Library and how to use the Chat Completion API to chat.

8. OpenAI .NET Library – Tools – Learn to use ToolCalls to execute external functions in all chat modes with .NET.

9. OpenAI .NET Library – Image API – Learn how to use the Image API to generate images with different models, and how to let the Chat Completion API call the Image API through tools to create images.

10. What's next? – A brief look at further learning directions after finishing the course.

Who is this course for?

• C# developers ready to leap into Generative AI

• Engineers looking to integrate ChatGPT into their C# applications or tools

• Developers interested in mastering Blazor Web App development alongside AI

Prerequisites:

This course is marked as "all levels"—from the perspective of learning GenAI development with C#. However, the following background is recommended:

• The enthusiasm for learning GenAI using C# (MUST)

• Basic knowledge of C# programming (MUST)

• Basic knowledge of ASP.NET Core web development (Nice to have)