C# When are we pass arguments

Question

Sometimes in some methods we are using passing arguments but sometimes we are not we are directly using : for using arguments
Why is it

Answer 1

Arguments make code reusable
That means less code to write, less code to maintain
By using arguments you only need to write one method instead of three
And you can pass arguments you did not think off in the first place.

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https://code.sololearn.com/c1a21A205A1A/?ref=app

Answer 2

sneeze yes why did not you use res or out at this code

Answer 3

In this example, I did not need to change the value of name. So pass by value was enough.

Ref and Out do change the value of the argument in a method.
https://code.sololearn.com/c0mzKfHb0nuM/?ref=app

Answer 4

sneeze //by value : The value of A can change within method, but the outside the method the value of A is not changed

Answer 5

sneeze i didnt understand why

Answer 6

thank you so much sneeze i understood

Answer 7

Because some arguments are input only.

public int Add(int x, int y)
{
return x+y;
}

In this method the value of x and y are important to get the return value.
But once this method has finished you do not need x and y anymore.

public void PrintX(int x)
{
Console.WriteLine(x);
}

The method returns nothing, the method need a input value x. But this value, is only used in the method. So it does not need to be changed and returned via a reference to the main method.

General rule, try to return as less as possible