c# 写一段代码

Sure, here is a simple example of C# code:

using System;

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

This code is a basic "Hello, World!" program in C#. It uses the Console.WriteLine() method to print the message "Hello, World!" to the console.