The Program.Main() boilerplate can be unnecessarily verbose.

Top-level statements in C# 9 let you write code with a script-like experience. The statements run as if inside a compiler-generated Main method, and any functions declared alongside them are local functions of that method.

Code

Now

Console.WriteLine("The answer is " + UltimateAnswer());

static int UltimateAnswer()
{
    return 42;
}

Before

static class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("The answer is " + UltimateAnswer());
    }

    static int UltimateAnswer()
    {
        return 42;
    }
}

Notes

• Only one file in a project can contain top-level statements, and they must come before any type declarations
• args is available implicitly, and you can await or return an exit code
• Because the functions are local, other types cannot call them
• Taken further by file-based app directives ^{C# 14.0}

More information

• Specification
• C# Fundamentals
• What's new in C# 9.0