To start learning about C#, you can create a new project by select File -> New project.

c# project

Enter your project name, then click the OK button to complete. It's easy is not it

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
    class Program
        static void Main(string[] args)
            Console.WriteLine("Hello, world!");

Now, we'll add a "Hello, world!" string to your main program. The main thread will begin when your program start, to display results on your screen we use WriteLine method, to Read value from keyboard you can use ReadLine method.

Now, press F5 to run your program, you will see the black window as below.

c# console application