C # First job (Hallow world)

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Text;
Using System.Threading.Tasks;

/*namespace Hallowword
{
Class Program
{
static void Main (string[] args)
{
Use the System console object
System.Console.WriteLine ("Hello world!");
}
}
}*/
Class Hello
{
int somevariablename;
static void Main (string[] args)
{
Use the System console object
Console.backgroundcolor = consolecolor.red;
Console.foregroundcolor = Consolecolor.green;
Console.WriteLine ("Hello world!");
}
}

A little bit of understanding of the mistake, resulting in the middle did a wrong, but the strict sense has not done wrong, but add color when the problem is not big.

C # First job (Hallow world)