How to use multiple methods in C#?

I may be completely wrong because it is C#, but in java, you'd have to pass x and y in as parameters.

Code:

//in main, below taking inputs
Console.WriteLine(add(x,y));


//add method
public static int add(int num1, int num2){
return num1+num2;
}

Alright, I'll look that up and give it a try. Thank you for the response.