Coding⏱️ 2 min read📅 2026-05-31

How to Fix: Startup.cs class is missing in .NET 6

Missing startup.cs class in .NET 6 API, how to add DB Context?

Quick Answer: In .NET 6, the Program.cs file replaces the Startup.cs class. Add your DB Context to the Program.cs file's OnInitialized method or the Main method.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

In .NET 6, the Startup.cs file has been removed in favor of a new approach. The Startup.cs file was used to configure and set up the application before it started running. However, with the introduction of .NET 6, this has changed.

💡 Why You Are Getting This Error

  • [Cause]

🔧 Proven Troubleshooting Steps

Method 1: Configure Services in Program.cs

  1. Step 1: In the Program.cs file, add the DB Context configuration using the services.AddDbContext method.

Method 2: Use IHostBuilder to Configure Services

  1. Step 1: In the Program.cs file, use the IHostBuilder to configure services. You can add the DB Context configuration using the AddDbContext method.

✨ Wrapping Up

To fix this issue, you need to configure your services in either Program.cs or the IHostBuilder. You can do this by adding the AddDbContext method and specifying your DB Context.

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