```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Task;`

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

```

I am just trying to get started off in C#, and as I was writing my helloworld, I met my first compilation error.

> 
> ERROR: Script compilation failed. [CompilationErrorException] error
>  CS0234: The type or namespace name 'Task' does not exist in the
>  namespace 'System.Threading' (are you missing an assembly reference?)
> 
> 
> 

I am running the latest .NET editing in VScode.
Hope for your help.