can somebody explain me what does “passing by value” and “Passing by reference” mean in C#?

Question

I am not quiet sure about the concept of \"passing by value\" and \"passing by reference\" in c#. I think Passing by value mean :

    int i = 9;

Answer 1

Passing by value means you are passing the actual reference to the location in memory for that object. So if you have a class, something like:

CustomObj aObj = New CustomObj();
aObj.SomeString = "Test";
someMethod(aObj);

And a method header like so:

someMethod(CustomObj objIn){
     objIn.SomeString = "Changing by value";
}

And wrote out to the console:

Console.WriteLine(aObj.SomeString)

It would produce "Changing by value" instead of "Test" because we have a reference to that object.

By value, conversely, does not work this way.Keeping with our example above:

int byValue = 0;
someMeothd(byValue);

someMethod(int numIn){
   numIn++;
} 

Console.WriteLine(byValue);

Would produce "0".