Reference type still needs pass by ref?

Question

Consider the following code (for simplicity, I did not follow any C# coding rules).

public class Professor
{
    public string _Name;
    
    public Professo         


        

Answer 1

Regarding on 'passing a reference type' vs 'passing by ref (by using ref key word)', after my research my take away is this:

If you have a reference type object, and keep this object passing from one method to another, the entire time the objects are pointing to a certain location of the memory. If you work on this object for example by changing the property value, this will cause change to the original object. Think as if, in the different methods you were talking about the same person all the time; and in one method you changed the color of the shirt of that person. So that will cause change in the original person object as well.

But, on your path of jumping from one method to another, if you create a new reference for the object (as you are doing by writing 'p=new Professor("Jon")'), you are basically breaking the link between the object in a new method and the original object. Your 'p' now references to another location in the memory. So whatever change you make in this new location of the memory, it will have no effect whatsoever to the original object. However if you want to change the original object address and have the link, you need to use ref key word. BECAREFUL TO USE THE REF KEYWORD, because once in any method, you make the original address in the memory change to a new address (by using ref keyword), all the changes to the original object done in other methods are now gone.