Program.cs entry point

Program.cs contains the entry point of your .NET application—the code that runs first when the application starts.

Traditional Main Method

using System;

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

Top-Level Statements (C# 9+)

// No namespace, no class, no Main method
Console.WriteLine("Hello World!");

Command-Line Arguments

// With top-level statements
if (args.Length > 0)
{
    Console.WriteLine($"Hello {args[0]}!");
}