C# Feature – Top-level statements

Overview

Top-level statements allow a single file program without explicit Program class or Main method.

Introduced In

C# 9 (2020)

Before

class Program
{
  static void Main(string[] args)
  {
    Console.WriteLine("Hello");
  }
}

After

Console.WriteLine("Hello");

Gotchas & Best Practices

• Only one file can contain top-level statements.
• The implicit Main may be async if you use await.