where am I mistake?

Question

namespace Restart
{
class Program
{
static void Main(string[] args)
{
int num;
int age;
TestMethod(out num, out age);
Console.WriteLine(num,age);
Console.ReadKey();

}

static void TestMethod(out int x, out int y)
{
x = 12;
y = 2;

}

}
}

Answer 1

Also you can use it in this syntax:
Console.WriteLine (String , Object) where the String is used as format.e.g.

int Age = 35;
String Name ="John Doe";
Console.WriteLine("Your name is {0} and you are {1} years old", Name, Age);

The {0} and {1} represents index of arguments following the format string.

Answer 2

the first thing to do is using "toString()" method on num variable (the same with age), when you write:
Console.WriteLine(num,age);
and also put a + sign instead of come, here is correction:
Console.WriteLine(num.toString() + " " + age.toString());

or you could write like that:
Console.WriteLine(num.toString());
Console.WriteLine(age.toString());