When you create a new project, starting with C# version 6, you will see the following Program.cs:

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

It could be scary for some people: no static Main entrypoint, no namespace, no usings. Actually the above template, as mentioned on the commented url above, is translated to this:

using System;

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

If you like the old template more, you can just copy it to your Program.cs without any issues.