// This is C# 7 and above
public static (int, int) Add_Multiply(int a, int b){
return (a+b,a*b);
}
static void Main(string[] args)
{
int a=10, b=20;
int add, multiply;
(add,multiply) = Add_Multiply(a, b);
Console.WriteLine(add);
Console.WriteLine(multiply);
}