Why use the 'ref' keyword when passing an object?

Question

If I am passing an object to a method, why should I use the ref keyword? Isn\'t this the default behaviour anyway?

For example:

class Program
{
    s         


        

Answer 1

With ref you can write:

static public void DoSomething(ref TestRef t)
{
    t = new TestRef();
}

And t will be changed after the method has completed.