Modify method parameter within method or return result

Question

What is the difference between

private void DoSomething(int value) {
    value++;
}

and

private int DoSomething(int value)          


        

Answer 1

Everyone else seems to be suggesting the difference in variable passing, but I noticed something different:

If the example code you are displaying is a simplification of something you are already looking at, then you might want to note that in your second example:

private int DoSomething(int value) {
    return value++;
}

The value will return then increment. So if you do the following:

public Main() {
    int val = 1;
    Console.writeln(DoSomething(val));
}

Your output will be 1.

Let me know if this helps at all.