[C#] Try Top-level statements

// See https://aka.ms/new-console-template for more information
Console.WriteLine("Hello, World!");

using System;
using System.Runtime.CompilerServices;

[CompilerGenerated]
internal class Program
{
    private static void <Main>$(string[] args)
    {
        Console.WriteLine("Hello, World!");
    }
}

foreach(var a in args)
{
    Console.WriteLine($"arcuments: {a}");    
}
Console.WriteLine("Hello, World!");

namespace TopLevelStatementSample;

// Compiling error
Console.WriteLine("Hello, World!");

namespace TopLevelStatementSample
{
    // Compiling error
    Console.WriteLine("Hello, World!");
}

error CS0116: A namespace cannot directly contain members such as fields, methods or statements

// Compiling error
void Greet(string message)
{
    Console.WriteLine("Hello sample class");
}

error CS8802: Only one compilation unit can have top-level statements.

namespace TopLevelStatementSample;
public class SampleClass
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Hello sample class");
    }
}

warning CS7022: The entry point of the program is global code; ignoring 'SampleClass.Main(string[])' entry point.

Hello, World!

using TopLevelStatementSample;
class Sample1
{
    // can't write classes at the top of the file.
}
// Compiling error
Console.WriteLine("Hello, World!");

class Sample2
{
    // can't write classes at the middle of the file.    
}
// Compiling error
SampleClass.Main(new string[0]);

var s3 = new Sample3();
class Sample3
{
    // OK.    
}

using TopLevelStatementSample;
void Greet(string message)
{
    Console.WriteLine(message);
}
// OK
var message = "Hello message";
// OK
Greet(message);

SampleClass.Main(new string[0]);

namespace TopLevelStatementSample;
public class SampleClass
{
    public static void Main(string[] args)
    {
        // Compiling error
        Greet("Hello sample class");
    }
}

error CS8801: Cannot use local variable or local function 'Greet' declared in a top-level statement in this context.