Why can't we call function like this

Question

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

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int res = Area(int h=5, int w= 8);
Console.WriteLine(res);
Console.Read();
}
static int Area(int h, int w)
{
return h * w;
}

}
}

Answer 1

Parameters don't need to be declared, you can just write:

int res = Area( 5, 8 );

or you declare them first:

int h = 5, w = 8;
int res = Area ( h, w );